On 2010-07-14, Bill wrote:

Also if you load a vehicle with too much weight, the wheel bearings can get
wrecked. Axles, bearings, wheels, and tires have weight ratings as well.

Bingo!!

Look at a real 3/4 ton rear axle, then your 1/2 ton rear axle.
Whole different animal. As for tires, you betchya! I was once
stopped and cited in a company gravel truck because the FRONT TIRES!
were not the proper ply/weight rating.

nb