At long last, I got the tank mounted.
It was made more difficult by having the bed on the truck & roughly 600 lbs of crap in the bed whlie I was working. You really want as much space as you can get working on these things...
My results so far:
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And from the side:
What I did in the end was to cut the lower horizontal piece off the frame's C channel for the rearmost 8.5", remove the rearmost cross member and narrow the frame by 3/8" or so on the bottom rails. Total cost of mods: $10 worth of sawzall blades and cutoff wheels. If I'd had the bed off the truck, I could have gotten the tank in without cutting the rearmost lower "C" section. I could not have dropped the tank with the bed attached, though. I'll have to fab a removable cross member (or 2) and finish running lines & power, but I think the worst of it is done as far as my fuel system goes.
All with a fractured arm!