The # TT53012C 5.30R12 tires you'd looked at are just about a 1/4 inch narrower and about 1/3 of an inch smaller in diameter than your existing 5.30-12 tires. The # TT53012C would work perfectly fine for you, and if your existing tires are bias ply, the 5.30R12 will have a smoother, cooler ride. Excess heat builtup is the main cause of tire failure so keeping the tires as cool as possible is essential. The # TT53012C is a Load Range C tire with a 1050 lb per tire/2100 lb per axle rating.... view full answer...
In order to realize their full weight carrying capacity, trailer tires should remain at their maximum pressure as stated on the tire's sidewall. When fully pressured up, your current tires have a capacity of 2170 lbs per axle. When you subtract the 1300 lb weight of the trailer, you're only left with 870 lbs for payload. Running at a lower pressure rating reduces the weight capacity of your tires, but the actual capacity is unknown because the tires are tested at the recommended full pressure.... view full answer...