As far as raising the toilet, you can purchase a "riser" that attaches to the toilet and mounts to the floor using the same mounting studs. I had done this to my trailer. Most rv stores should carry them.
Find the make of your toilet and look on the internet for your parts list. I have a Tetford booklet and a riser wasn't listed. Then I called PPL Motor Homes in Texas and they had the riser I needed. It makes the toilet ADA compliant. The toilet is so comfortable now. Before it felt like you were dropping down onto it.