Coming from straight blade experience, Hiniker's wiring harness is universal. So yes, it will work on your other truck (assuming it is a v-plow harness) The only new part you will need to complete it will be the headlight adapters (short adapter which are unique to the truck). I'm not sure what a GMC cabover is? semi? So you will need to purchase the headlight adapters for this truck. Ya, the diagram is the best way to figure out the wiring.
Last edited by Snowzilla; 01-07-2013 at 09:45 PM..