In my opinion, the GM 5.3L is not capable of pulling much more than the truck, by itself. I have just traded for a 2013 K1500 with the 6.2L, 6 speed, and 3.42 gears. It is a sports car without the trailer, but with the trailer in tow, it isn't exactly a powerhouse, even with the advertised 407 HP.
I have towed a 4,000# boat with a 5.3L, 6 speed transmission, and 3.42 gears..... it felt like I was dragging the anchor even in tow/haul mode.
Contrasting my experence with the 5.3L pulling 4,000# and the 6.2L pulling 7,500#, I can't imagine pulling a 5er with anything less than a K2500 and 6.6L Diesel.....
Just my $.02.
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2013 6.2L K1500 Chevrolet
2006 Hornet 27RLS
1987 23' Grady-White
2005 20' Angler CC
2005 17' G3 CC
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