Dogs on a leash is really a common sense safety rule. Not everyone loves dogs, and if left to their own devices could wander to other sites, etc. As a responsible pet owner, I would assume that you would want to keep your dogs on a leash in a new to them environment.
I wish you luck in selling your rig, but like everyone has stated, get yourself a Costco sized jar of Vaseline....
2013 Dodge Ram 1500 Express, 5.7L HEMI
2015 Forest River Wildwood 28DBUD
2015: 7 Trips, 20 Nights Camped
2016: 7 Trips, 23 Nights Camped