A lot of us here do have our rig's model/year/manufacturer in our siggy or profile. However, it is not "required" by the forum moderators/creators to do so. And, there is no reason for it to be.
I think it is plum silly to expect everyone to post such info unless an OP has a question about a problem they are having with whatever their RV is! Then and only then should a poster need to give that info!
Does that mean...if any of us also ventured into one of the other forums here we must "prove" we have a pet to visit the pet forum, we are great cooks to visit that section, we are "well anything" to visit any other pages?
This forum has so many wonderful sub-forums to visit, all free for any of us to join in any conversation we want...and many of us do visit more than one forum and love it!
Just relax and enjoy!