Gm paint is thin so I would try an area with 1500, then go over it with 2000. I did a 08 Tahoe and the paint was very thin. If you do try it, sand in a back and forth motion, do not cris cross, keep plenty of water going over the area where you are sanding. Also if you hear a squeak type noise that means there is dirt uner the paper, stop and clear area and restart. Also get a squegee so you can check your work area often. Also do not use fast strokes, go slow so in case dirt gets under the paper there is alot less to correct. If you have any other question just ask, I have wet sanded hundreds of vehicles, this is all I can think of at the moment.
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