It would be nice if there were a simple yes/no answer. But to continue TMPilot's response, tires from different manufactuers (and even different lines of tires from the same manuafacturer) have different dimensions. In other words, a 14-inch tire from one manufactuer won't have the same dimensions as a 14-inch tire from another. You need to know what the dimensions are for the tires you are considering. Once you know the dimensions, there are two rules of thumb to use.
1. The width of the new tires should not exceed the width of the old ones. The loaded width of a tire is part of its specification, and can be found online for the tire you are considering. This is a rule of thumb, and you might have 1/4 inch to play with, but not much more than that.
2. According to Dexter Axle, who makes the wheel and axle assembly for TMs, there should be 3 inches of clearance above the tire - between the tread and the wheel well liner - when the trailer is loaded. If you put on a larger tire, its loaded radius will likely increase, which decreases the clearance you have above the tire. But the difference between a 14-inch Marathon and a 15-inch Marathon, for example, is surprisingly small. Again, loaded radius is a spec that you can look up for the tires you are considering. This rule of thumb appears to have a lot of flexibility, since the max deflection of the suspension is only an inch or so (again, according to Dexter). So, many of us (including me) run with only 2 inches of clearance, and are quite happy.
So - it is time to get out your ruler, do some measuring, and then get on line. Hope this helps.
Bill
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