Sprinter Towing

My Sprinter is a 2008 chassis with the 3.0L V6. I have a boat that weighs in at about 2,300 lbs. When I planed a trip from Oregon To Maryland that included a cargo trailer, I chose to not exceed that weight to avoid any unforeseen issues like overheating. 6% grades at high altitudes can be tedious. Towing that weight only had a .5 to 1.0 penalty on MPG. Careful packing got the tongue weight just right on the Uhaul 5X8 cargo trailer with no adverse handling. In fact, the trailer served to stabilize the Sprinter when encountering big trucks going in either direction. I think it was due to some sort of dampening effect. I was going to tow a small car the previous year, but had to abandon the idea. After the first transmission blew up (never towed anything up to then) I was a bit apprehensive. The car would require a dolly. That and the car was way over the target of about 4,000 lbs. I got that number from people that tow with the Sprinter. I stop to ask everyone I can and the conclusion I got was get a Toad you can go with 4 down and under 4,000 lbs. If there are no mountains between you and your destination, I think you can fudge the numbers. By the way neither the boat trailer or the Uhaul had brakes. Never an issue with downgrades. Hardly touch the brakes. Anything heavier or grades over 6%... that's another story.