Great information here; and a few questions coming back:
The neighbor mentioned that HD Chevy PU's are tough to work on as far as getting at the part that needs fixing. Mentioned dropping the frame (!?!) to get at bottom of engine? Not the same for his same year Chevy half ton PU. So that is what I am curious about. Yes - bigger brakes cost more but is the labor involved in servicing them similar. I figure the heavier duty parts cost more but last longer (as was mentioned) so that is a wash. Unless the labor (mine or shops) is twice as many hours.
Also longevity. I diesel with 189k on it is not as intimidating to me as a 1/4 ton with 189k. Not sure where the .5 ton falls in there.
What am I towing? Have not purchased it yet. Still looking. I've learned a lot on here about the safety of staying well below the complete picture provided by numbers (ex: add about 1k to UVW; factor in passengers; stay below 85%; find a scale; proper WD hitch w/ sway control - you guys have taught me well). Current trailer of interest has a UVW of 4800lbs and is 28' long.
Thank you for sharing your wisdom and experience.