Ok, maybe I'm not nuts then. There is 2 rigid metal brackets riveted/bolted to the frame that follow the contour of the side of the tank closest to the frame. Each has a strap that wraps around the bottom, outside side and top supporting the tank and pulling it into those rigid brackets.
I built mine by looking at pictures in catalogs and that have been provided earlier in this thread.
Thanks for calling out if I'm off here.
