I would also go with longer then the Diehl 24 inch gear legs. Mine are 30 inch ( https://dl.dropboxusercontent.com/u/32133949/002.jpg ) but 28 inch would probably work well on a stock KR2S. You'll have to make your own as the 30 inch legs are probably not available for purchase. Jeff Scott and I have the only two sets that Dan Diehl ever sold. I'd also go with my Aviation Products lightweight single fork tailwheel assembly modified to accept the 6 inch Matco wheel and pneumatic tire. The noise level over a solid wheel is night and day.
Larry Flesner