My '04 Avalanche Z71 4x4 w/ tow pkg says to use the Tow/Haul switch and I think it says to drop down 1 gear. Hey, I read the manual 5 years ago. I can't even feel my 12'x101" snowmo trailer w/ 2 4-stroke 2-ups behind me but i sure know when I have a 2,999# boat and trailer behind me. Feels like I'm towing my tractor without a trailer. I don't tow more than a few hundred miles a year so fuel economy isn't an issue.
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