Yes old thread but will say that we were next to a TT this summer in a CG with sites really close together and they had a street side door at the rear - directly opposite our rear entry door, mere feet away. Not impressed but luckily they never used it. Looked like a 2nd door into the bathroom. First time I've ever seen a street side door on a TT.
Not sure what brand it was but was a common brand like a Keystone or similar. If you care about your own privacy or not ticking off next door campers, I would avoid a street side door, esp. if you plan to get around much to different CGs.