DOT Endurance Test for ST Tires NOT same for LT Tires

Well the LT tires on out 5er have a speed rating of 103 mph, and a load rating of 3,042# about 400# lower than an ST tire of the same size. Our 5er weighs about 13,000# with a little over 10,000# on the four tires. I feel better driving down the highway between 65 and 70 with the 103 mph rated LT’s than I would on ST’s speed rated for 87 mph!