My boat trailer tires are wearing rapidly and I'm wondering why and how to solve this problem. The trailer has approx. 1500 miles on it and the tires are very worn (evenly)on the inside half of each tire. The trailer is a 1999 American brand Galvanized boat bunk trailer with a 2600 lbs 18' Regal bowrider sitting on top. The tires say that they can handle 1760 lbs each and the tire pressure is ok. The boat and trailer were purchased as a set from the dealer. When towing, the trailer tows well, with no apparent problems. Thanks in advance for your help.