With a thinner or different material, I would agree.
Mine is made from 1/4" 316 stainless steel. I work in a factory and tested another piece I had in 4 ton arbor press. Maxed out the press and it was only slightly bent. It ain't flexing in this truck.
I thought I remembered your mount. How thick was it, 3/16 or 1/8". With that, I would have agreed a support was needed.
http://www.rc-monster.com/forum/show...80&postcount=8