I use many federal campgrounds. The America the Beautiful Pass, Senior edition, gives at least fifty per cent off on campgrounds. Many of the Corp of Engineers, and some National Forest Campgrouns have limited hook ups.
Passport America didn't work for us as there is many restrictions of when it can be used.
I still use and older version of Microsoft Streets and Trips, old version of Trailer Life Directory and RV Plan N Go. Our Rand McNally GPS has many campgrounds in it. Works very well for us.
uscampgrounds.info works good for government type campgrounds.
Plan you trips away from interstate highways and you will find many out of the way places.
Plans on getting off the road early on holiday weekends. We tryto find a place on thursdays and don't leave until tuesday after the holiday.
Bud
USAF Retired
Pace Arrow
2003 Chev Ice Road Tracker