Size max and budget for Mexico and Guatemala

Having a GPS is a good backup to have in emergencies. Some people love em, others don't. When I first came to Mexico I was returning from Patzcuaro and came to a Y branch in the road. No signs indicating which way to go. I pulled off to the side of the road, sat there for about 20 minutes watching the few buses and trucks coming pass me. Most went to the right, so I went that way and came to a medium size village and found out where I was. In Costa Rica we were traveling a mountain highway and came to a roadblock. There was an avalanche in the mountains a few miles up the road and we were told it would be 2-3 days before we could get thru. Using our GPS we found an alternate route we could use. Our paper maps did show the detour but not the entire distance. Another time in Guatemala a bridge was washed out and traffic was driving thru the river to cross. We didn't want to do it as the water was up to the bottom of the vehicles, too easy to start floating away. Once again, used our GPS to find an alternate route. Otherwise we would have had to turn around and go back to the first major highway intersection to continue on. Going thru cities the major roads are marked in heavy yellow lines, I call it following the Yellow Brick Road. When traveling with friends they would always ask how I know how to get thru the heavy traffic and make the correct turns. Years ago traffic signs where almost nonexistent in Mexico. I bought my first one in 2008 and wished I had bought one sooner. I travel extensively and in the middle of nowhere I come to a road, use the GPS to see where it goes and if I want to drive it. I have 3 bags of paper maps and use them as a backup but nothing like an up to date GPS. I will admit you have to learn how to read one, more than once I was led astray. In southern Mexico I was taking a shortcut to a camp area, the GPS showed a nice road. I could see the camp area across the highway but the road had turned into a sidewalk! Driving a car and a RV are so different you can't compare the two. Where a car can go, a RV can't. Also, I can find the nearest Starbucks and Walmart, need my morning mocha and a place to stay for the night……