I know I'm coming in a little late (just joined this site) but I saw this discussion and had to comment. My last truck was a 2011 silverado reg. cab with the 4.3 v6. Yes this motor had balls. Not that quick from 0 to 60, but boy this thing could tow.
I have a dump trailer I use to haul stone, dirt etc for work; my heaviest load that I towed with the 4.3 was over 14000lbs
(truck and trailer). When I weighed the truck alone I tipped the scales at about 5300, so I was towing over 8700 lbs.
Not to bad for a v6 especially with 3.23 gears. The truck never seemed to mind the weight, a little slow from a start but would cruise effortlessly at 55. To be fair, I live where it is flat, I don't think this much weight would go over well with steep hills but around delaware no problem. I no longer own this truck because I got the power bug and traded for another '11 reg cab leftover with a 5.3v8 I like that it is faster from a stoplight, but I'll never tow anything with it that the
v6 couldn't.
Oh, and the v6 sounded better at the tallpipe,
Joe S.
P.S. the v6 did get better gas mileage while towing, about the same as the 5.3 unloaded.