I have a 17 foot aluminum center console with a 4stroke 115 and a 30 gallon fuel tank on a single axle aluminum trailer. I would not consider the boat heavy. I always use trailer tires, specifically, ST205/D14's. I find the both tires seem to wear excessively on the inside and outside underneath but not in the middle. I just put 2 new tires on in the beginning of Aug 2008 and have since put 4-6K miles on them. They are showing a fair amoutn of wear already. The tires are rated at 1760 lbs at 50psi. I keep them between 42 to 45 psi. Also, they are not balanced. I have a few quesions concerning the tires: How many miles do good/decent trailer tires last? What is causing the inside/outside wear pattern and how can I get hem to wear more evenly and last longer? Should trailer tires be balanced (my tire guy said it was not necessary)? Thanks in advance.