Most of the AWD versions are lighter weight too. I'd look for a Quigley GM van instead.
Also, since you are in SOCAL, you can always get Weldtec Designs to do a 4x4 conversion. Ain't cheap though.
As WhitH said, there are a few of us GM guys around. Don't know of a GM focused site.
My signature doesn't always show up when using a mobile platform, but I have a Quigley GMC. Lot's of good info here even for us non-Ford guys.
If you aren't familiar, check out: https://weldtecdesigns.com/