If I may:
You can replace a 7.00-15 with an ST225/75D15 of the same Load Range, the only thing you need to be aware of is that the ST needs 0.3" more clearance between the tire and the trailer. That's not likely enough to worry about, but it should be checked.
Here's the math:
7.00-15LT: Width = 8.0" on a 5.5" rim with an allowable rim width range of 5.0" to 6.5". Overall diameter = 29.6" with a load carrying capacity of 1710# at 45 psi (Load Range C)
ST225/75D15: Width = 8.8 on a 6.0" rim (8.6" on a 5.5" rim) with an allowable rim width range of 6.0" to 7.0". Overall diameter of 28.3", with a load carrying capacity of 2150# at 50 psi (Load Range C).
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