Thousand Trails isn't a bad deal (specifically their annual zone membership) IF their parks are close to where you want to camp and IF you are spending several months not days on the road. Their parks are not where we want to currently be and we are weekend warriors who mostly visit state and national parks so it wasn't a good fit for us. YMMV.
Same with Passport Amercia. While you don't have to be a full timer to benefit from PA if their locations are convenient for you, we have found the many varying restrictions from the parks we want to stay at were deal killers. Of course, we live in the state with the most national parks in the US as well as has amazing coastal camping and weather, so I guess I shouldn't be surprised the PA parks in our preferred areas have more restrictions.
