I used to have a pair of 'em with 9.50R16.5's that I ran whenever I pulled my 35 foot 5th wheel Rv trailer. They rode a little rougher than the 235/75R-15's,but,with the much stiffer sidewalls,they handled the trailer like a dream-even at 85 mph. I've seen them on occasion in wrecking yards,there's still some out there. Mine had the early style centers,used the 50's style hubcaps.They were very heavy wheels,but that meant they don't bend-mine were so true I zero balanced each one with less than an ounce of weight.
Have you checked any wheel/hubcap shops,or e-bay?
Used to be,J.C.Whitney carried 'em,for about 50 bucks each. you might check them out too-there's a toll free # you can call to ask about products you don't see in their catalog.
Speed