Size ristrictions at state/federal parks

Forty feet is pushing it very hard. Here are California’s and the National Park’s limits. Most states have a chart. Many NPs you’d be at the limit but forget most boondocking possibilities at that length...and dirt roads. For me a 40 footer would be toooo limiting.

https://www.parks.ca.gov/RVlength

https://outdoorsrvmfg.com/wp-content/uploads/2017/11/National-Park-Trailer-Length-Chart.pdf

Some parks in California have a 22' restriction due to the root system of the ancient trees.

Size is normally based on the living units length. The toad does not count.
40 foot is a big rig! Many have numerous slides which can be come issue in many government campgrounds and some commercial.
You may want to look at shorter rig with the slides.

Rqtpis,

First, know the over all length of your rig as it travels.

You pretty much will have to consider this on a single park basis. Many places have pull-though slips that could accommodate your whole rig as it travels. Most do not.

As I recall, a Prius cannot be towed 4-down, so you need room for it and the dolly.

Those that can accommodate a 40foot coach (In my experience) can also park a towed and dolly. But, you will have to confirm that before you give them money.

Matt

As others said, it really is something that must be considered on a case-by-case basis. There's no single magic cutoff value where suddenly site are no longer available, generally speaking, but rather the largeer the rig the fewer sites it will fit in, until possibly at some point it's impossible to fit in any site at a particular campground. Even if there are some sites that would fit you, if they all happen to be occupied or reserved it's no help, even if many other sites you can't use are free.

Here in Vermont, a 40 foot motorhome would be quite restrictive for the state campgrounds, many of which were built by the CCC and have not been vastly changed since then. Even my 32' motorhome can require a little flexability as to when and/or where to go camping. In other states and areas it's less frequently a big concern.

It's also worth noting that sometimes--certainly not always--the maximum lenghts stated online for particular sites are extraordinarily conservative and larger rigs can easily fit (and navigate the roads to get to the site). Other times, they are precise and accurate. It can be helpful to call and speak to a ranger or someone familiar with the actual campground. Reservation clerks often don't have detailed local knowledge, particularly if the reservation system is statewide or national.

Keep in mind that sometimes the restrictions are not about the sites but are about the turns to get to the sites. Been to several that had pull-throughs big enough to accommodate but getting to it was almost impossible due to trees and tight turns, especially the 180s where you have lanes that are one-way.

Big Basin, jdc! My Winnie, per manufacturer specs, is 21’ 11”.

OP, rent a 40 foot A and try it.

The only way to be sure is to take a car or pickup to the park and check it out THEN decide.. I have been to several state/national parks where I'd not want to take even a small RV the turns are too tight. It was tight for a 1992 Chevy Lumina APV mini-van let alone an RV. I've been to others where the compuer says "25 foot maximum" It really means 125 feet. What can I say.

Yes. The site length refers to the coach length but there will also be room for a tow car. Not all State parks will fit a 40' so be sure you know the length restrictions before you go. We have run into many which have 35-36' max length.

We've found that sometimes the site length restrictions are related more to the access roads than to the actual site dimensions. We've in a few where we just met the length limit and the road in or access to the site was really a tight squeeze for us. The site itself though, was plenty big enough. On the other hand, we've also been to a few parks where the length limit on some sites either just don't make sense or the park has update the sites without updating the limits. That has caused us to fib about our length a few times when reserving sites that we knew were plenty long enough and easily accessible.