[Bigrig]

Just picked up our rig last month and immediately changed the entry level toilet and replaced it with a Dometic 320. Did not try to clock the toilet a little counter clock wise, installed it right where the Thetford was.
Door slides and does contact the porcelain bowl corner slightly, wood toilet seat while still new, does stay up when open. When it wears down, becomes loose and well not hold position, I will replace it with a slow closing lid.
You may of all ready done your install, as its has been a month or so but I thought this would help someone.
Ultimate toilet, Thetford Aria Classic, I thought it was more better than any toilet including stick house toilets, just wont fit in this 3811 without a major plumbing modification.