I run the early rostyle steal wheels on my 2dr, technically they are a tube rim. I have run with and w/o tubes, using TSL 34x9.5x16 SS Super Swampers and currently 255/85R16 KMs. I spun a tire once w/o tubes on an off camber uphill section mostly due to not having checked the air pressure when I put them on the truck. (oops) the other 3 tires were between 6 and 12 psi. I had tubes put in when I had the KMs mounted, and got my first flat in less than 25 miles. I now have no tubes. There are tubes for bias ply and there are tubes for radials. The bias ply tubes don't work well with radials. I have not had a problem down to 14 psi w/o tubes.
HTH
Mike and Myles