yes, here are some. I don’t. Have any of the platform, it’s just two 2x4s cut to sit on the side fender rails with a piece of plywood on it to set the cot on. I initially used clamps on the cot but found with it strapped down that the clamps were not needed.
My solution was to get a KampRite tent cot and built an inexpensive platform that sat on the inside fender rails. It was the perfect height for easy in and out. Works great! I use a tote to store the sleeping pad, sleeping bag and pillow.