Cheri -
If it were me (and obviously it's not) I would add a lift kit and move to 14" tires. That would not be cheap, of course, since you have to replace the wheels as well as the tires. But it would give you some tire margin that you (and most of the rest of us) don't currently have.
I imagine that someone is thinking "yeah, but upgrading the wheels and tires doesn't increase the weight capacity because the axle capacity doesn't increase." I agree - but it doesn't seem to be axles that are failing. If you maintain the same total trailer weight and increase the tire capacity, it doesn't change the load on the axle. But it ought to make tire failures less likely.
Bill
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