We do offer both bias ply and radial ST-type trailer tires in a 12-inch wheel size although a ST155R12 is not among them. In a radial type we have size ST145/80-12 tires in Load Range D or E, which are rated for 1,220-lbs at 65-psi and 1,520-lbs at 80-psi, respectively. These are only 10mm narrower than your current tires and would work fine on 4-inch wide rims. You can see both items on the linked page, parts # AM10130 and # AM10140.
It is a good idea to have more weight carrying capacity... view full answer...
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