Here is my experience with my current 5er listed below. It came with Tacoma 235/85/16 LTs from factory. The cert. label on the left front corner only list 235/85/16 for size no LT or ST. I just with the last 2 hours had the OEMs replaced(build date of 48/04) with Firestone Transforce HTs of same size. While the tires were off the rims I looked for thier weight rating label and found them to be rated for 3450# and 110 psi. The axels are rated per cert. label as 5080# and have 8 studs per wheel. I see absolutely no restrictions on what style tires I put on whether LT or ST. The dealer had no qualms of putting the LTs on. I made the dealer real happy as I also had them install new tires on TV while there with a set of 265/70/17 Transforce HT LTs. I will see if I am happy with myself in 40 days after our trip to Montana. As said only my experience.