I got a Curt Hitch from U-Haul (#13486). Got one side on loosely, the other (over the muffler) seems too far away from the mounting holes, so that I can not get the bolts to thread. Is this how it's supposed to fit?? The left side is only on loosely, so that the plate on the hitch is not in contact with the frame. Maybe U-Haul sent me to wrong hitch? Seems like the hitch mounts should fit between the frame rail fairly tightly. Help is requested ASAP!!~