The camping page on the Army Corps of Engineers website lists lakes with camping facilities, which can include RV access. Recreation.gov lists all Army Corps of Engineers campgrounds and recreation areas. The guidebook "Camping with the Corps of Engineers," available on Amazon.com, also contains a list of sites.
Finding campgrounds that include RV camping facilities on the Corps of Engineers website and Recreation.gov requires viewing the details of each individual campground. Both websites allow searches by state or campground name, while the Corps of Engineers website also offers a search by lake name.
"Camping with the Corps of Engineers" includes details about campground fees, facilities and activities.