No experience with the lift, but I was running pro comp 15x8 w/ 5 inch backspacing with 31s. The same size should work good with 33x10.5 (BFG km2 and I believe Toyo mt are available). I couldn't find the part number I had, but if you get on summit, narrow the search to 15x8 w/ 5 inch backspacing and 5x4-3/4 bolt pattern, there are plenty of choices.
Here are some pics that show the width with the 10.5 wide tires. No spacers on it, just the wheels.