Something you might be able to do is extend the hitch, rather than the trailer tong. For ~100 bucks, you can buy a 18 inch receiver extension. I see an advantage in that most boat ramps level out after you get into the water. Extending the truck hitch puts the tong lower in the water, making it easier to get the boat on. You will also find have the pivot point farther away from your rear axle makes it easier to steer the trailer when baking up. If 18 inches is enough, it might be easier to use. If you tow it with the extension, make sure you are within the load limits for the reduced tong weight.