Looks like the M55 may be the tire of choice; largest size is 275/70-18 (close to 33x10.5, which is taller but narrower than the 285/70; great for sudden weather strikes) and the load capacity is right where the wheels I want sit (American Outlaw Bunker, 18x8.5, matte black; about 3500# capacity). Lots of great reviews for it;not much more than the AT or MT in the size I wanted to fit my stockers or the Revo's I just bought, about $297 each.
The truck is kept outside; going this route will require RV style wheel covers when parked as I don't plan on spending quite that much again.