OmarR is correct. There are many opinions on this. Mine is that you should stick with GM Accessories. They have an Extended Range 2-way remote that'll tell you the tire pressure and give you remote start. Then add the shock and inclination sensors. This combo should give you what you are looking for, plus a remote that'll give you the odometer, fuel gauge reading, and 2 to 3 times the range of the standard remote you already have. Additionally, because it's a 2-way system the truck tells the remote the command went through. I have it and love it. You do need the dealers help on install though as they need to program it to the trucks computer and tell GM your VIN needs to reflect that you have those accessories. There is a vendor (SuperchargedSS) on here that will sell you all 3 items for approximately $350. Dealership install price should be around $200 if you have it all done at the same time.
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