I have the Garmin 2595LMT mounted on top of the radio bezel with the suction cup mount.
One of the must have features for us is the custom POI files that are free to download here POI Files for United States & Elsewhere | POI Factory
They have a lot of custom files of interest to RV'ers. You will need to get Garmin's free POI Loader to load them.
One custom POI that saves us a few $$ is the Passport America campgrounds that we try to use frequently. Others of interest are "Offbeat Tourist Attractions", national parks, national monuments, state parks, truck stops etc.
If the gps does not have it, my wife pulls out her phone and says, "OK Google".