Jim, I suspect something other than the keyboard stand or cart caused that keyboard to bow. Probably excessive heat prior to transportation. The top shelf I was referring to on my Rock and Roller R-10 cart supported the entire length of the keyboard, so bowing is not remotely possible with that. As for my X-stand, in more than 3 decades of performing, never had a single arranger keyboard bow on me, and believe me, I have owned many, many keyboards.

Good luck,

Gary