[JandC]

X2 what Dick said. Using just a I-phone for navigation, unless you are staying on interstates and US highways only, will soon get you into trouble.

We not only use a RV GPS but I consult my Trucker's Atlas prior to planning a route just to double check for low clearance issues.

Having a back-up camera is okay but I seldom look at it. The DW on her phone and having my phone on speaker is how I back up. I only use my mirrors.

The single most important piece of safety equipment IMHO for someone who is going to actually travel in their RV is a TPMS (tire pressure monitoring system). A Trucker's Atlas would be next, then a RV GPS, and maybe 5th or 6th down the list would be a backup camera.