Just picked up a 2017 Indy 550 121". Just wonder if anyone has done any modifications to this type of machine to accommodate a second rider in a pinch? I was looking at the Kimpex Seat jack but they don't have this machine listed as being compatible. I know it is a very short machine with a short tunnel extension, but wondering if anyone has been creative? I ride alone 95% of the time, but occasionally my 9 y/o daughter will tag along. Thanks for any info you may have.