The set up you are talking about I have. I have my bilistines set at 2.8. nose higher than the rear by a little bit. If I get my 35's then it wouldn't be as noticeable I want to put a 1/2" -1" block on the rear so that she sits just right.
Just look at your threads on the stock U bolt and measure, if you can get away with the added size block with having stock bolts then you wouldn't need a new Ubolt.
2.8 level, Train horn, bed cover, headlight brows, blackout grill fins, side steps, reverse work lights, Cameo neoprene seat covers, catchalls, onboard air system.