So I blew out a tire over the weekend, and was looking to get 2, maybe 3 new ones so they all match. I find my running tires are labeled ST175/80 D13 My Spare is labeled B78-13ST Shopping around I find that Discount tire offers ST175/80R-13/C1 BLK for just the Rubber for $69 + mounting etc. JCWhitney has C78-13ST Load Rating D With rims for $115 Etrailer has ST175/80-R13 Looks like Load rating C with Rims for $99 My camper says it's GVWR is 2900 lbs. Two 1350lb rated tires doesn't seem like it would support the weight. Help me make sence of my tire debacle. What should I get? Should I get all new rims or just get new rubber mounted? Seems to be about the same price either way.