I'm no expert on golf carts, but I'm guessing they weight at least 500 pounds as a gas model and probably closer to 800-900 for electric. Add that to the versalift of 130+ pounds and you are awfully close if not over the hitch rating for a static load without weight distribution, which doesn't appear to be an option.
Have you looked up your vehicle on this chart? You didn't say what year, but I didn't see more than 500 pounds for any suburban listed, which is also the limit for a class 3 hitch. You can change years using the link at the bottom.