Try www.campertrailers.org
Good luck to the other forums, diversity is good and necessary. Some of our members will come and go, visit other sites, maybe even camp in a tent , but a core of members will keep on contributing.
That's a fair call, and sounds like a reflection of most forum interest groups e.g fishing, 4x4, hiking, motorbikes, boating. Usually find members join a number of the same groups and change patterns of usage depending on personal factors e.g. Family, work, changing interests.
Diversity is a great thing.