I am a moderator on a military truck forum-we got this same type of request a few years back, and the overwhelming responses were the same: let's stick to OUR brand (of truck, in that case) and leave the others to their own forums (and yes, we consider our military truck forum the BEST one too!).
I think we all support inquiries regarding other brands if we have expertise to share-nothing wrong with that, but I too would rather not have a column of different brands subset into "OUR" forum!
GVP