I have been using Allstays Camp and RV. As long as you have cell service it is great. It shows your current location and what, if anything, is around you. You can filter for different things to keep the clutter off the screen. It looks for RV sites, both private and public. You can also filter for low clearances. RV business for repairs, parts, etc. Rest areas are also shown. And my favorite: it shows locations for Cabela's and Costco.
2008 Chevy Silverado 2500 Duramax Crewcab
Jeep Commander - sold
Flagstaff V-Lite WRB26