My advice is just don't go higher than the 6,000 pounds you are estimating your trailer is going to be. For two years I was towing 6,700#s with my 2003 Tahoe with 3.73 gears, and didn't not feel I had the control or power needed to tow 6,700#s. It constantly shifted on hills, and I was pushed around on the road. I was using a weight dist. bars, and a double anti sway system. I was so tired of driving with white knuckles and gripping that steering wheel so tight, I bought a 2007 GMC 2500HD and now have the control and power to take my trailer anywhere. So again, make sure you are not exceeding the 6,000 pounds your estimating and get a good anti sway system since you will have the short wheelbase towing. Hope this helps!