The Chevy Express/GMC Savannah line is infamous for a random stalling problem. I found many online discussions about it the last time I was shopping for a used van.
We've always used portable chemical toilets. Odors have never been an issue. The tank is sealed well. We have a Thetford and a Dometic. (One in our trailer and the other in our van.) I prefer the Thetford manual flush over the Dometic pressure flush ...
