I did that in a 5th wheel but ordered at 17" high commode also. DW's feet dangled so I had to take the riser out and just use the 17" high commode. My knees are bad and don't bend well past 90 Degrees so i need the added height to accommodate them. Plus I need all the help raising my weight and it's easier to get centered of the feet.
More expensive for a new commode, but worth it in the long run. The riser is not difficult to install. A new commode is not difficult either.
Wayne MSGT USMC (Ret) & Earlene (CinCHouse)
2008 Winnebago Destination 39W
It is what it is, and then it is what you make of it.