[bsmith0404]

One thing that differs extensively between LT and ST tires is the load carrying capacity. Many people make the mistake of thinking an LRE is and LRE is an LRE. That's not true or accurate. The load range rating is based on a tires toughness. It used to be based on the number of plies, but today it's more the number of ply equivalent. For example, a 14 ply tire may not actually have 14 plies, but have fewer stronger plies equivalent to 14 standard plies.

The Load Index (LI) is the big difference between LT and ST. If you do a comparison of LT and ST tires you will notice this. For example, looking at a 235/80R16 you will notice that the max LI for an LT is 120 (3086 lbs). The lowest LI for an ST tire is 124 (3527 lbs). That's a different load carrying capacity of nearly 2,000 lbs.

The question to ask yourself here is how much LI do you need for your RV. For me with a 15,500 GVWR, a 120 LI is too close to the edge of the tires capability. BTW, I've stepped up to a 235/85R16 with a 129 LI and from what I can find are only available in an ST.