New rig

Good evening,
Well we finally decided to take the plunge. We just picked up today a 2003 GMC 2500 HD Sierra 4x4 with a 6.0 gasser. We are towing a 2007 Trailrunner 2700 BHS with super slide. I have been towing this camper with a 2000 Silverado 1500 4x4 with a 4.8L. Didn't do that bad but last year we decided that the truck with 134,500 miles on it was getting tired hauling this size camper. One question I have is I was able to keep my Primus Brake controller and will the wiring harness from my silverado fit the new GMC?
Any info would be great.
Thanks,
Greg
 
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