The next class up is; Class 4 (Class IV) trailer hitch Trailer hitch with weight carrying rating of up to 10,000 lbs gross trailer weight and 1,000 - 1,200 lbs tongue weight. Although many times any hitch with a capacity greater than 5,000 lbs gross weight is referred to as a class four. Also, check the labeling stamped into the hitch to make sure it is a 350# tongue wt.
Best bet would to spec it for the sprinter so it bolts up. Like these;
Sprinter Hitch: Towing & Hauling | eBay
Just dbl check on tongue weight rating, because the farther you get away from the receiver, the greater the mutiplier on tongue weight.