I ended up with a stock arch rear spring with the stock 2 inch block and about 2 inches of lift on the front to fit 35s on it with 17inch rims. Tires do not rub anywhere no matter what you run over or how sharp you turn. If I wanted to put up with some rubbing or bend/trim some stuff I might be able to get 37s on it. I doubt I will do serious off-roading with a 20ft long truck so this is plenty good.
Little odd picture of it unloaded so you can see stance of it empty. The blurry spot used to be a deer. Magic eraser is, uhm, interesting.
And then for those wondering if the truck still "works", here it is with a little over 2 yds of river rock in the back. 5k-ish lbs, close to bump stops, but not on them.