been trying to locate a wet bath cassette toilet unit that you see in pop up campers. I don't know where the trailer companies find these to install because I cannot for the life of me find one to buy for a trailer rehab project?

You could try ppl Motor homes parts. 1-800-755-4775. I ordered a toilet riser from them several yrs. ago. No one else had what I needed. It arrived fast and in excellent condition. It fit perfectly.