I have a question regarding trailer tires... My 7x16' landscape trailer is currently running st205/75D15 bias ply tires, and I have been getting less than a season of use before they are totally bald. I need to replace them and would like to not have to buy another set in August. I was thinking of putting 225's on it so I can get load range D tires... So I guess my question is, can I expect better or worse wear resistance with the wider tires? I know that the harder the rubber compound is, the less they will wear, Does anyone have a recommendation on a hard rubber trailer tire? Also, would switching to a radial help my situation? I'm asking here just because any time I go into a tire shop and start talking about trailer tires I get looked at like I have 6 heads, and just end up with the same crappy tires that I have to replace 4 months later.