Just for grims, I'm going to throw another number in the equation. When I was looking at my Landmark, before ordering, The factory rep was talking about tires on "his" brand of trailer. He asked what I was running on my Sea Breeze ? I told him 285-16 @ 80lbs X 6 tires. He said essentially you are running truck tires, I said say what? He went on to say look at the tread design, If the tread wraps around the edge, that is to give traction in turning. Then he showed me the tires on the Landmark. Large grooves in the tread, no tread on the edges (more like a commercial tire) and operate at 110lbs. he explained that these tires have better rolling resistance and won't grab when turning the trailer in sharp turns thus tearing up less grass etc. I haven't looked at my tires since this discussion started, but I think I have Trail America tires. I probably only have 3-4 thousand miles on them, AOK so far, knock-knock....since Feb 06'.