No state limits the length of MHs to 40' but some like CA require a CDL type licence for RESIDENTS if they have a 40+ MH. When I take my 42' into CA I do NOT have to have a special licence... it's called reciprocity of licence but there is no reciprocity of length. Maybe with a four door Jeep behind a 45' MH you could be over 65'. I have traveled thousand of miles at 42' (with others that were 45') in Canada and never had an issue plus I've seen a bunch of Canadian tour buses that were 45'.
There are some roads that have length limits on them, some even less than 40'. If there is something on one of those, that's what the Jeep is for. In Yellowstone my 42' becomes a 40' and I've never been measured... anywhere. Granted making a 45' into a 40' might trigger the tape measure but there are plenty of public CG sites outside Ystone and the Tetons.
I made the mistake 15 years ago of listening to those on here that said 36' max for the Public CGs we like. Did not take long to realize that is not true, even 13 years ago when it was harder to find info on the web than it is today... no RV Parky or Oh Ranger park finder apps. Our favorite CGs are USFS CGs that do not take reseverations BUT do not show up Friday thinking you will find a site big enough... show up Monday and you almost have the CG to yourself as most have gone back to work.
We love boondocking with our big rig as it has big tanks so going for a week does not require cutting back on anything. We have found going into a USFS CG late Sunday and leaving on Friday works the best for us. We travel, resupply, and use a Private CG (to dump) on the weekend... the exception is a long holiday weekend where we often stay put over the holiday. This past summer we went to South Lake Tahoe without reservations on Labor Day (we rarely make reservations more than on the day we might need it) and found a site in the city park BUT it was on Monday, not Friday.:S
I now advise to buy more RV than you think you need, ONE TIME. I do not understand all of the bath and half floorplans in almost all of the 40' or longer DPs today. I'm full of it, but not that full... to each there own.
