Yes, size DOES matter. There are many old parks out there which were laid out long before anything over 30' & way before slides were even thought of.
We just came from a CG in Mt Rainier NP. The sign at the entrance read "Vehicles over 32' DO NOT ENTER". We chose to not see that sign.
By model we are 34' long. By actual length we are inches short of 36'. With truck, bumper to bumper, we are 55' long.
There were 3 sites long enough for our size, letting the trailer aft of the wheels hang out past the site itself to inches from a tree behind. The trick was getting into the site & navigating a particularly nasty CG turn.
We did it only because the site opposite was empty & I get excellent direction from the DW who I have absolute in. This is not the first time we have stuffed ourselves into a place that we really did not belong.
The answer to a 36' toy hauler by model length but actually 38' in actual length is, NO, you will not be getting into many very beautiful SPs & NPs.
