RichardCranium
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I used to build the police fleet for a north texas city..I'm an ex GM Tech. The luggage rack is no problem. What you need to know is those trucks are made for speed and handling! Dont know if you got the owners manual with it but GM states you basically have No towing ability! The truck has a special tune and no speed limiter! K9 cop told me he had his to 148 GPS no problem. Cops sit arround in ac ideling all day...as long as they did the proper maintenance I see no problem. Dual batteries are for extra equipment added..there are specific places to add up fitter electronics. Do not add anything if you dont know. Lucky you..you got a hotrod from GM. I called my GM buddys with a VIN. cause I wanted to reflash my ecm in my truck..not possible