I have caught my cladding on some bigger ledges and a few of the lower screws have ripped through.
I think if you welded a plate over the existing tank skid that was bent up slightly to fit to just under the lip of the cladding with a piece that extends out under your spare. Maybe bend some 1.5 inch tubing around the tire part extending out to the corners of the skid to reinforce it and form a sort of bumper.