Hi greengirls - welcome to the Forum!
Yes, vintage kin are very welcome here at AIR. So many of the systems are generic to the RV field; for instance, water heaters have been approximately the same modular size in either 6- or 10-gallon options for decades.
Welcome, welcome, welcome... Post in a specific topic forum
to get more attention on any given issue. Our members' individual experiences tend to be variable but specialized. Your flange for instance -- I'd take a picture, resize it to 900 x 1200 pixels and post about it at the plumbing subforum
. Come up with a clear thread title explaining your issue. No "Houston, we've got a problem" titles, you know what I mean...
More general threads (and pictures please
) could be placed in the vintage kin