What can I tow with my Suburban

I currently have an 07 with the 3.73 gearing (4 speed). My trailer dry is 6000 lbs and loaded with a full tank of water is a hair over 7000. I am in Southern Utah and spend most of my time dry camping in the mountains (usually in the 8-10000 foot elevation) between Utah and the Colorado Rockies. It does fine. I’m not the fastest one on the roads going up the mountains but I also don’t try to be. On the freeways I can hold 65-70. I am below all of my ratings (rear end, tounge weight, payload, etc). While I would like a bit more power it works for me. I will purchase another suburban when I need a new tv. The only thing I added was an additional tranny cooler.