Final note on wheels/tires/rims, for those with singles instead of duallies on the rear. (Eric?)
Consider the possibility a previous owner swapped out the duallies for singles. Entirely possible when you consider the cost of two truck tires versus four.
Doing so would cut the load capacity of the rear axle in half. The result could easily be a dangerously overloaded rear axle.
For example, 235/85R16 Goodyear SR-A tires have a Load Index of 120, which translates into 3,086 pounds maximum per tire. A pair of singles means safe rear axle loading cannot exceed 6,172 pounds total for vehicle, cargo, and passengers. A pair of duallies means up to 12,344 pounds is safe.
While relatively minor, routinely running close to maximum tire capacity will also result in the tire tread wearing out sooner. So, you will probably find yourself replacing tires more frequently.
