Jon,
Actually 14 inches for all of the stands would work for me. I just measured the XLVII and the rear stands would be fine at 14 inches.
The front body jacking points vary from 14 5/8 inches behind the front wheels to 16 ¼ inches in front of the front wheels and that’s allowing ¼ inch below the plates to allow slipping the stands in. I can always add a square of plywood shim(s) to make them work.