Here's the step bumper I built last winter for my '59. While not 'factory', it has period details I have seen over the years in my travels. This one won't sag down with a tap. The brackets are definately WELDED and it, along with the receiver hitch assembly are bolted to the frame with 1/2" grade 8 bolts. I realize in a good, ok, huge bump, it could crumple a fender, but the main section is a 3/8" section 3x6 'H' beam. The step loop is an old crowbar. I am debating installing some angled supports from the outside edge of the bumper to the top of the rear stake pocket. That's really common on the old bumpers for support when running with the tailgate down. And Bill, I was in Twisp last week. Never saw a cabover, but did see a 50's dodge wrecket and a '38 ford fire engine. The '38 had been burned up badly in a barn fire, but the owner wouldn't consider selling me the perfect stainless steel script 'hub covers' of the big full floating rear axle. Said he was gonna 'restore' it.