3 Things You Need to Know before Buying Your RV

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There are so many factors to consider when buying an RV. In this article, we will talk about the three main factors that you must think about: length, slide-outs, and height.Almost once a day someone asks me what RV they should buy. It’s my least favorite question to get because it’s an impossible question to answer! There are so many factors to consider when choosing your RV!

I have three neighbors, all married couples in their 50s.

One has a 45-foot Class A diesel pusher.

One has a 40-foot fifth wheel.

One has a 25-foot Class C.

Everyone is different! Choose your RV based on your personality and needs, not what other people choose. While we’ve only had motorhomes and I think they are awesome, a motorhome might not be right for your needs. You do you.

There is a lot to consider when purchasing your RV. If you’re just starting to look into RV life, I’d recommend checking out my book, A Beginner’s Guide to Living in an RV, available on Amazon.

In this post, we’re talking about living space and I break down three of the biggest factors to consider when picking your rig.


“If my RV is too long, I can’t visit national parks!”

Let me kill this rumor right here. While there are many roads and campgrounds in national parks with vehicle length limits, this does not mean you cannot take your RV to the park. Let’s take Grand Teton National Park for example. Moose Wilson Road has a 23-foot length limit. Oh no! You can’t visit the park.

Wrong. Just enter through one of the many other entrances without limits.

But Signal Mountain Campground only allows RVs under 30 feet! True. But Gros Ventre Campground allows RVs up to 45 feet. And spoiler: 45 feet is the legal maximum length for motorhomes in most states. So even if you buy a 45-foot diesel pusher, you can visit the park.

I completely understand this fear when it comes to length. But national parks and camping go together. There will be ways for you to visit the park even if you’re in a big rig. Plus if you’re in an RV longer than 30 feet—which is one of the limits we see most often—you’ll probably have a tow car that can take you everywhere. Alternatively, some parks also run buses. We took the public bus up Going-to-the-Sun Road in Glacier National Park (24-foot limit).

So don’t let the fear of missing out on national parks color your decision making. Choosing the length of your rig depends on a lot of factors, but it boils down to two important details: weight and floor plan.

1. Weight 

Weight is especially important if you’re planning on purchasing a trailer or camper. You’ll need to look closely at the towing capacity on your truck and the GVWR (gross vehicle weight rating) of the rig.

Do not, do not, do not buy a rig that is heavier than what your vehicle can tow. You’d think that was common sense, but I’ve seen way too many pictures of people who have torn off the beds of their truck because they didn’t think about this!

If you’re looking at motorhomes, weight is less important—especially if you buy a diesel pusher.

But if you plan on towing a car behind your rig (we tow a Honda CR-V), you’ll want to look at the towing capacity of the motorhome. If you don’t want to tow at all and use a motorhome as your primary vehicle, you’ll probably want to look at buying a smaller rig.

Related: Check out our post on our many different towing experiences here.

2. Floor Plan

Weight is an important detail to note when deciding your ideal length for an RV, but the floor plan is typically the deciding factor for choosing the length. Think about your must-haves in your rig. Maybe you know you 100% need an oven or two bathrooms or sleeping space for eight. Only certain lengths of RVs will meet all these requirements.

For us, we knew we wanted a floor plan that allowed two table tops for workspace, plus an oven and plenty of counter space in the kitchen. With only two people in our household, a motorhome between 30-35 feet was ideal for us. We upgraded from our 29-foot Class C to our 33-foot Class A and it is a WORLD of a difference. Four feet is a huge amount of space when it comes to RVs. 

To get an idea of what length of rig you’ll need, check out floor plans on manufacturer’s websites. You can see our Winnebago floorplan and even walk through an online simulation of our RV on Winnebago’s website. Our floor plan is the Winnebago Brave 31C.

Photo Credit: Joe Hendricks

Slide Outs

Slide outs (sometimes called pop outs or just slides) are portions of your RV that slide out when you’re parked to increase living space.

If you’re thinking “Alyssa, that’s the stupidest definition I’ve ever heard,” you’re probably right. BUT I’ve had to explain slides to a lot of confused people who actually thought my RV was 12 feet wide when I drove it down the highway. Oy vey.

Long story short: Slides are the best way to gain more living space. This is great if you want a shorter rig with ample space.

Slides are most commonly offered in class A’s, C’s, super C’s, fifth wheels, and travel trailers. Slides can be electric or hydraulic, depending on the manufacturer.

Do you want a rig with slides? YES.

They are a game-changer. Our first RV had zero slides. It made hosting guests or walking past each other, ever, pretty much impossible.

We now have two slides: One that’s about three feet deep and contains our dinette, and one that spans the entire length of the house and is about 18 inches deep.

These two opposing slides are fantastic for opening up the room and giving us a lot of floor space. I’ve seen very few other rigs with enough floor space to set up a stand-up desk and a yoga mat at the same time. If you prefer a more open concept RV, finding a rig with opposing slides is key.

You can expect to have issues with your slides at some point during your ownership.

They are known to be finicky, but the space is worth it. We’ve had issues with our slides on four occasions.

After purchasing our rig, we heard a few negative comments and reviews of full-length slides. We have had our large slide worked on three times in the past 18 months. In each instance, the slide was not coming in correctly. The front would come in faster than the back, or vice versa. Once the difference was so bad, our slide was out 6 inches in the back and not at all in the front. It was a nightmare!

The mechanic said this is called being “out of time.” (Dramatic, right?)

He re-timed the motors in the front and back of the slide so that they would start operating at the same speeds again. He said this happens often, especially with larger slides carrying a lot of weight.

Re-Timing Your Slides

A friendly mechanic in Denver taught us a trick to re-time our slides ourselves, should we ever get into trouble again. I’m not mechanically savvy at all, but let me drop some premium layman’s terms mechanical advice on ya.

Our dinette slide was giving us trouble and when took it out one day, there was almost a 12-inch difference between the front and back of the slide. It was dangerously close to getting stuck and Heath was outside manually pushing one side of the slide in while I religiously held down the button inside.

Typically when bringing in your slides, you hold down the button and do not stop for any reason. I remember the dealer drilling this fact into us when we bought ours. Do not stop while bringing in or taking out the slides!

However, when they start getting out of time, you can re-time them yourself by taking the slide out a few inches at a time, or until you notice the sides of the slide are going out at different speeds. Then stop and bring the slide back in until you line them back up again. Repeat until you have the slide out all the way. 

Heads up: It would sometimes take a full five minutes just to get out slide all the way out! 

After learning this trick, we would take the slide out three or four inches, using the lines of the faux tile linoleum to measure if each side of the slides were moving out at the same pace. It took about 20 sessions of bringing the slide all the way out and all the way back in, inching it back and forth the whole time, but our slide did re-time itself. 

Since getting repairs at RV service shops is often expensive or impossible, it felt amazing to be able to fix this issue ourselves.

That was almost a year ago now and we have had zero issues with our slide since!

Side note before we move on: Unless you’re buying a fifth wheel which is properly outfitted for excess weight, do NOT buy a rig with a refrigerator in the slide. I’ve heard horror stories. The less weight on a slide the better!


You have the least amount of control over the height of your RV. (I noted average heights for each type of rig in this post for reference.)

Here’s the deal with height: It is not a huge deal. Low clearances are rare, especially in the west and in the south. It likely will never affect visiting a specific destination, though it may alter your route.

Between All Stays, Co-Pilot, and our Rand McNally GPS, we never worry about running into low clearances. I recommend using at least one of these to check your route for clearances. Our Rand McNally GPS is built into our RV and our specs are programmed in, so we can trust it to never take us down roads we can’t handle.

In years of full-timing, we’ve only found ourselves in one terrible must-u-turn-now situation with low clearances. We were driving the I-95 from Connecticut to NYC and Heath took a wrong exit, one with about fifty WARNING SIGNS: 8 FOOT CLEARANCE AHEAD signs. (He told me he saw none of them.)

A nice guy in a pick up flagged us down and said that if we wanted to keep our roof, we should follow him back to the interstate. We made it back on track in no time and I’m now a queen at backseat driving to make sure we never find ourselves in another heart-stopping situation like this!

Ultimately, there are a lot of factors to decide on when picking your first RV. Buying an RV is a mix of extreme excitement and a lot of stress in making the right decision. But it is totally 100% worth it! 

What is your biggest consideration when buying your RV?

15 Responses

  • “Do not, do not, do not buy a rig that is heavier than what your vehicle can tow.”
    haha So true! We have a 16k lb fifth wheel and drive a Ford Focus and a Subaru Impreza. We ain’t goin’ nowhere in that thing!!! hahaha Anyway, even though Ed has a full-time stationary job, it drives us NUTS we cannot travel on weekends with it! We are SO ready to go to a Class C or A and just be able to travel when we can!

    • Aw that would be a bummer! I didn’t know y’all were thinking of getting a motorhome! I highly recommend it. Definitely would make weekend adventures way easier!

  • Hey Alyssa – Great information on aligning a slide. I did not know that could happen. Thanks!
    About RV length – while limitations on roads is uncommon, length limitations in campgrounds is very common, especially National Parks and Forest Service Parks. 30 feet seems to be the most common cutoff.

    • Oh man the slide tip definitely saved our butts! It’s a good one to remember!

  • We’re not on the road yet, but have been researching for over a year now, and are planning to hit full time in August. We’ve narrowed down to a 28′-33′ 5th wheel, but one of my biggest considerations now is cargo capacity. I’ve noticed that each model varies widely on how much can be carried in the rig. I’ve been almost sold on a particular model to later find out it had an unacceptable amount of cargo weight capacity. Check those labels!

    • Ah that’s a good point! It’s such a big deal when it comes to fifth wheels especially!

  • Good write up about choosing the right size RV. When it comes to motorhomes the first thing a novice RV hears is the length restrictions in national parks. This issue should be one of the last factors in deciding on length. It’s my view that if you have a motorhome you should not be using it to tour the park. Either use your tow car or for the limited time you are touring rent a car. If you can afford to own a larger motorhome you can afford to rent a car for those limited times touring a national park.
    A much bigger issue is how much you use the motorhome. If you just use the motorhome for a several week vacation and a few weekends a year, then it is much more likely that you can get away with a smaller unit. But if you started RVing after retirement like I did and used the motorhome to see the country (lots of travel versus staying for long periods in one park) then towing a car is recommended. In that situation a larger unit would likely be much more comfortable. As noted in the write up there are a lot of other factors that come into consideration.

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  • As a 41 year trucker and RV owner I strongly suggest anyone considering pulling a long trailer or 5th wheel take some CDL training even if it is just online. Spend time talking to truckers. You’ll never regret it.

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  • Hi, such a great blog, thank you for sharing and i cant wait to read some more. Thanks again

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