I'm buying new tires for my trailer (2 horse, straight load, bumper pull). The place I'm looking at can not get me the size I currently have on the trailer, which I believe are 215-75 15's. The size he can get me are 205-70 15's. I know nothing about tires and the tire guy said there shouldn't be much of a difference, but I need to ask to be sure. Looking around on the internet, I have not seen that size recommended, but I haven't seen anyone say not to use them either. My trailer is small and I don't see myself pulling any more than one horse for a while, but that doesn't mean it won't happen. Any opinions or facts you could give me would be appreciated.