Second question first: Do you have air brakes on the coach? If yes I recommend the M&G brake system as it connects to the air brakes on the coach and everything is under hood of the Traverse. I had that installed plus a Blue Ox base plate and tow bar on my 2010 Enclave. I also had the Blue Ox fuse by pass switches put on so I did not have to pull any fuses. The Enclave was ready to tow for $3800 tax included.
AS Joelyn 5 said, see the threads on "Need to pull fuses with a charge line". In the links I have put below you will find documents that tell you which fuses to pull on a 2009 Traverse. I am pretty sure you do the same as I do on my 2010 Enclave...ECM and Batt 1. Both under the hood. Pay careful attention to the pulling (or bypass switching) order or your car's electronics will get very mad at you.
GM Lambda series vehicles are Traverse, Enclave, Acadia and Outlook. Sameo-Sameo.