We'll be doing a long circle trip around the US after DW retires in a couple of years. Not a whole lot specifically for RV-ers travelling around the US as far as books go. I bought these general purpose ones and found them to be reasonable: NatGeo USA 101 A Guide to America's iconic places, events and festivals; Insight Guides United States on the Road; and NatGeo Guide to Scenic Highways & Byways, The 275 Best Drives in the US. The latter two have lots of color photos which is nice. I also have the small book on driving Route 66. While you may not travel on any of it, it is an interesting read. Have had a number of folks tell us to do it sooner than later because there won't be much left before long.
Curious as to what CGs or RV parks you'll be staying in. I'd like to go freewheeling style but DW insists on pre-booking everything way in advance. We now have a membership in Thousand Trails and can stay at any of them in the US but they don't have anything in the middle area of the country.
If you end up going in that direction, "camping" in Vegas is an interesting experience. There's a few CGs close to the strip. I understand it's best to avoid the southern/eastern states in the summertime due to high humidity and temps.
On roads, I enjoy towing both on interstates and slower/secondary routes - it's all good. Some interstates are quieter and easier to drive on. Some of the interstates can be clogged with semis and a bit tiring and around major cities can be rather stressful with all the heavy car and truck traffic. I'd suggest looking online for videos of the actual routes you'd be on so you won't have surprises or be caught by construction, forest fires, etc.
Gotta have good access to the internet while on a trip to check on road conditions, etc. and check CGs, attractions and the like. We've been using Verizon 4G mifi on a pay-as-you-go plan but may switch to creating a hotspot on DW's smartphone or possibly use both. In a few places so far we couldn't get a signal on either. A good GPS will help a lot but don't rely 100 percent on it. Good to use paper maps and google to compare. If something doesn't seem right, it probably isn't.
Make sure to post highlights of the trip and have fun! :)
