Tire wear question? Help?

I have a 2002 ProV IFS 1900 with a tandem axle YachtClub trailer. The tires are the small 15 inch tires. They are the largest that will fit in the fenders. My tires typically only last about 3,500 miles of trailering. Two seasons for me. They “cup”/wear heavily on the inside edges of the tires while the tread on the outside seems barely worn. Is this a sign that the trailer is not set up properly or simply that it is too light weight for my boat? I rotate them every 1000 miles in the X fashion and they still wear noticeably. I’ve tried both the bias style carlile and various brand radials…both wear the same way. I am guilty of inflating them a bit high. What causes this terrible, expensive wear? Thoughts? Do I simply have to live with it? Is there a good trailer shop in the North Metro (Blaine area)?

If your getting “cupping” that looks like scalloping on the inside edge, then the trailer is bouncing. A possible sign that you have under rated axle and/or springs. I had that on my trailer for awhile. Would get about 3500 miles out of a set of tires. Ended up bending the axle at a ramp (hit something in the water) and had to replace it. When I did, I bumped up to a heavier axle and never had a problem since.

If it is inside toe wear, most often a hub is slightly out of alignment. Could be a bearing, weld on the spindle is off, bushing on a spring is broken/gone. A reputable trailer dealer should be able to spot the problem and give you direction.

We had a problem similar to yours on our current trailer. My tires sit perpendicular to the ground without the boat on it but when the boat is on it bends the axle a little bit and you end up only riding on half the tire. Put a 2′ square on level ground and against your tire. If the gap up top is more than 1/4″ it needs fixing. To fix mine I used a floor jack under the center of the axle with a 2″ piece of steel between the jack plate and axle, jack up, heat about a foot of the axle until it glows, let cool by itself, set down and repeat until the tires are square. I also welded a small piece of steel across it to strengthen it up when I was done. Good luck, hope this helps.

Get the axles(tandem right?) straightened… preferably with the boat on the trailer when they do it.

If you have a friend who races, use thier castor–camber gauge to check it and set the tires so they will run true.

One could also set the toe so they don’t wear also.