krobbe wrote:
Look at the RPO sticker in the glove box. The RPO codes are what options your vehicle has. GM RPO code link
GU6 - 3.42
K5L - HD cooling pkg.
KC4 - ext. engine oil cooler
2 questions.
1. What does the "Cargo not to exceed" sticker on the tire pressure sticker on the drivers door say?
2. What does the hitch receiver max weight(with WDH) sticker say?
Both of these "limits" will negate the max trailer weight you see in the manual.
This is the correct answer. Personally I would not tow anything heavier than you are towing now. But you need to know if that truck has the cooling capacity to handle it.