Stopped by the dealer today and they loaded up a 21 REN X for me. @Willy
Just as you and Usedtoskidoo say, fits (at least in my 10ft clam shell, which is a drive on drive off trailer (plates which mount the clam to the trailer appear modified). Snug fit, but fits. Looks like I'll go the the Super Clamp Rear for the back end, but otherwise GTG. With the windshields coming off that easily, I'll get my son to sew up some bags for mine and my buddy's windshield when removed from the sled.