Ok, back to work here. Reverse seat deep dish refers to the reference point for the "face" of the rim, meaning that the face is very close to the outer edge of the wheel, meaning that tire must be mounted in reverse as far as putting it onto the machine goes. Deep dish is a street tire reference to the width and offset of the rim( that was almost 10yrs ago). Your rim face is almost all the way to the outside edge of the rim, therefore there is nowhere for the valve stem to go with reference to conventional rims.

Back to the bumper, I took up Jack's advice and decided that the bumper would not be fully functional if I could not stand on it, and that would make me a hypocrite (by normal def, not Ldub's). So I went and picked up some 16ga sheets, and 5 ft of 1" 14ga square tubing. I will cut the tubing into 4-6" lengths and weld them vertically on the top of the crossbar of my bumper to act as support towers. I need to bend the new sheet metal to fit, and then weld to the front of the cross bar, and to the towers. 16ga is pretty thick and gives very little over a 24" length when stepped on, but with a tower every 6" or so to support the weight, it will be good to go. I WILL FINISH THAT PART THIS WEEKEND!! As for filler, I don't know yet? I will see. As always, this is a work in progress, and I accept suggestions that do not involve starting over, putting the plastic back on, and they must be at my quickly advancing skill level. So standby for updates, the garage isn't getting epoxied until next week, so its on now.