Recommended Books/Info for Overwhelmed Newbies?

Place a large, colorful post it note near the driver so you will see it and same for passenger. In big, bold numbers state - my coach is 12' 6" and there is not way I can go anything shorter.

Seriously, we just have the height of the RV where we can see it. It has saved us numerous times when Walmart put up a barrier that was 12' 4" tall. I tried to find the truck entrance, and just gave up going to shop when I saw how rough that part of the parking lot was. It has also helped with low bridges.