I have a GMC sierra 4x4 V8. I think its rated for 8000 lbs. Funny it has the Z71 off road decal on the side but it really has the Z85 towing suspension. I can't tell my boat is back there without looking. My tandem trailer with the Ford 4000 tractor you notice a little but no problem with acceleration (trailer has brakes) The tow mode button on the shift lever changes the shift pattern for heavy loads. Usually shifts around 1800-2000 rpm but in tow mode it will wind out to 2500-2800 rpm.
Wish it was Flex Fuel though. When you burn E85 fuel towing capacity is increased as well as HP. But then I would have to drive to St Louis to fill up.
The decal issue is a little strange. The Z71 package is rather expensive with the full undercarraige skid plate, springs and shocks for off road. The Z85 towing suspension is more as well but not as much as the Z71. This dealer did not even know this truck did not have the Z71 package. I had him crawl under the truck with me and showed him there was no skid plate. Running the VIN showed it reallly had the Z85 package (I would rather have the towing package). Anyway I beat him up on it and he cut the price by a lot of $$$$$.
I sometimes wondered if you actually got some options on cars or just paid hundreds for a decal. They said this was just an honest mistake, but I will check every option from here out.



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