Heed what PUCampin pointed out, for sure. This is what kept me from replacing the toilet in our old RV. The factory toilet had a dimension of 7-5/8" from the back wall to the center of the outlet; there was NO other toilet I could ever find (even after inquiring of Dometic and Thetford support folks) that would fit in that dimension. Just before we decided to trade it in, I was even considering cutting a recess in the wall behind the toilet in order to get enough room to mount SOMETHING different. That dimension is the killer!
