really sounds like ya just need to go to a good truck stop and purchase an atlas there. Most are pretty much the same just the prices are what changes. Walgreens and maybe cvs may sell them, I know they have folding maps. Another good idea is to visit each state on the net you plan to pass through and request a current map from them. I generally stop and get one if its a state I either havent been to before or dont go to very often.
I dont have a rv gps just the same as in my pickup, unless you are going someplace with a very big rig most will get ya through without issues. as an otr guy you should know a lot of the info on roadways may be bogus anyhow since it is always changing. there are some other publications out there about grades etc or just log in and ask, there are many here who can tell ya what ya need.