My wife had a '98 4x4 Tahoe (5.7 L) that we towed with on several trips, and it worked pretty good, although the rear end sagged somewhat so I put Deaver springs and a mild lift on it and it was much better, but I still prefer the longer wheelbase of the Subs for stability on long trips. Plus by going to a 3/4 ton you get bigger brakes, heavier axles, springs, and rear end, cooling etc. and not to mention as Richard Coop says, the ability to get the big block! I get 11mpg with my 8.1 towing or not, uphill or flat, with a 455 Ft. Lbs. of torque, It's easy to forget the boat is back there sometimes.
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