They stopped the 6.0L in the Avalanche in '07. The Escalade EXT still has it. It is basically like towing with a 1500 pickup. It might be a bit heavier than the pickup since it's basically a Suburban with the back 1/4 chopped off. Mine weighs almost exactly 6,000 lbs with me in it. I've never towed a travel trailer with it, but I have towed some pretty heavy stuff (most recently a U-Haul car trailer and '63 Impala). I can say that whatever that combo weighed made for a 13-hour, white knuckle drive.