I am with the most that have posted already, and I like the back roads, seeing the "Real America" I use a Trucker road atlas, and take the truck route's! I do use the interstates also, but most of the time, I like the two lanes! I did the same thing in my semi, as time was not a factor most of the time!
I am "old school", and sit down the night before, with my atlas, and plan my route, write down the hwy. #'s, the turn's, on a piece of paper, so all I have to do is glance at it when a turn is coming up, to make sure I am going the right way!
But I am different than the average RV'er, as I have drove the country my whole life, and rarely even have to look at the atlas! But when I venture off the interstates, I do write down the turn's and Rd. #'s, and if there is a bridge out, road closed, I take the detour, or another route that suits me better!
If you follow the truck routes, you will rarely run into a problem! In all Trucker Atlas's they have all the low bridges with the weight limits on all of the state roads listed, so if you have some concern's, all you have to do is look before hand, to make sure the hwy's you will be traveling on are OK!
Back Roads for me now days, with some interstate travel also! Rail!
__________________
Retired, and "Always on Holiday!"
1996 Monaco Windsor 38PB, "Mona" 275 HP., 8.3 Cummins, 3060 Allison 6 speed, 2001 PT Cruiser, "Bailey"