So supprisingly, my mom is telling us that we should buy an enclosed trailer for our sleds. We have four old Polaris Indy's. Our current trailer is a 18 foot hunk of steel. It's been a great trailer for the past 1o years or so. It owes us nothing. So, here's the problem, our tow vehicle is a 2002 GMC Yukon XL. With 2000 pounds of sleds, and approximately 6000 pounds of trailer, we're at the Towing Capacity of 8100lbs. It towed a car hauling trailer with 6000 lbs of Ford Expedition on the back for about 20 hours straight and did fine, but that was fairly flat driving. To get to the good snow, we have to go up a 10-12% grade. for about 10 miles or so. Anyone have experience towing a 4 place enclosed trailer with a 1/2 Suburban? It seems doable, we've thought of putting suspension air bags in, supposedly that would boost the capacity to about 9000 pounds. Any thoughts?