You need to check what states you'll be travelling to. Some states, SD, Montana, ND the max length is 75-80 ft. Most states have a lower total length limit 65'
Now will you get pulled over if you are a foot or two over the limit. Not likely but just be informed. Here is a good link to know what's what.
Good Sam Camping
Good luck with your plans.
Tony & Ruth........... FMCA#F416727
Newmar Dutch Star 4320, Spartan MM Chassis, Cat C9, Jeep Grand Cherokee,with Hemi, hooked up with a Blue Ox Aventa LX, and Brake Buddy.