I'm getting a lift next weekend and decided to get new wheels and tires all at once. I have a stock 92 explorer 4dr with a few mods. Do I need my wheel bearings changed when I get new wheels and larger tires. I'm running 30's with stock wheels and will be going to 32's I replaced the bearings about 2 yrs ago when I was hearing alot of highway humming. I do hear a little humming from the front tires when my truck bounces over bumps again. Could this mean a replacement?Will the 32's put more stress on my bearings...if so are there a heavy duty set out there?