There is a capped hole for a vent connection on the left top of the toilet. Thetford sells a boat vent kit that plugs in there, the instructions
here show how it works. It could be adapted for the Trailmanor, it would be necessary to use a flat, screened outlet. I can see that it would work better from the motion of a boat than we might expect it to on a parked RV.
Tom, lest you get too hyperbolic, there really are people of long duration on this forum who insist they have no problem with the toilet.