I put the riser on the toilet today. I thought I might get enough height from the vertical 1/2" pipe but the new compression fittings didn't give me the height extension that I was looking for. So I'm going to run over to Lowes and see if they might have a longer piece of plastic 1/2". If not I'll run over to the local RV dealer on Monday. I could force it to fit but it would put the entire pipe under stress. I'd rather not have that since I've seen screw on compression fittings leak in those circumstances. Especially when the trailer is subject to road vibrations.
Over all the job was very easy. On the Bravura Thetford toilet you pull a panel off that surounds the step flush pedal. That gives you access to two nuts (1/2') that easily unscrew. You unscrew the water supply from the back and the toilet easily lifts off.
Thetford supplies longer toilet bolts and 2 gaskets. You place the first gasket on the bottom of the riser, and place it over the sewer hole and over the bolts (holes match easily). Then you tip the toilet, remove the old gasket and slip on the new one. Then put the toilet onto the riser matching the holes in the toilet with the bolts. This takes a little patience but once you get it on, you start bolting the toilet down. Just do it evenly and eventually the entire assembly is good and tight. Reconnect the water line to the toilet and you are done.
In my case the toilet sits higher than the closet next to it which blocks the door. I find if the cover and seat are up, the door clears easily.
The cost of the riser was $31 at Camping World. The color was parchment which was the exact match for the toilet. They also come in white and bone color. Picture on the right shows the vertical pipe that I need to buy.
The picture in the previous post shows the before, and on the left below, the after.
FYI I did sit on the toilet and it is rock solid. The platform gives it great support. Patty's knees should thank me for this.