You can use the Provider ST215/75R14 Radial Trailer Tire - Load Range D # TTWTRTM2157514D, which actually have a slightly higher speed rating than your L rated tire; these tires have an M speed rating, but will work just fine for you. These are Load Range D tires with a 2200-lbs per tire capacity and are designed to be inflated to 65psi. The 108/103 is the load index of the tires which is between 1929-2205-lbs, which matches up with the Load Range D 2200-lbs capacity of these Provider tires.
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