a delicate, yet pertinent question concerning rv toilets

Fitting big toilet for RV is not going to be easy, or possible, but try first the raisers Camping World sells.
I had motorhome who had toilet set with very small knee room and was very uncomfortable.
Even bigger toilet would not add kneeroom, but once I added the raiser, it made huge improvement.
I was skeptic about 2" or 3" raise making big difference, but it did.