Thanks for the response. Correct me if I am wrong: The difference in width of say a 60” rear end vs. a 62” rear end, with the same sized tires, can be compensated for with wheel offset allowing the same wheel track? If this is true than is the only real difference cosmetic (how dished the wheels are) or are there other reasons why to go with a wider set up? There must be some reason why nearly all modern vehicles have such a negative offset wheel.
When you're building a hot rod the track width is whatever you want to get the look you want. Keep in mind too narrow of a width will keep you bouncing in and out of the driving lane groove on grooved highways and freeways.
You need to see what offsets the wheels you want are available in. If you're wanting 17 or 19" wheels and you put too wide of a rearend in you'll be stuck with positive offset wheels, which don't look good on these trucks (in my opinion). Sure, bearing wear will change based on offset, but if you regularly maintain your vehicle this shouldn't be an issue. If you go with a narrower diff you can always use spacers, but going with a wider diff there's not a lot you can do if it's too wide.