The same tire was on my JT when i picked it up. Very loud, very heavy and a so-so wet pavement performer. They do save on brake wear as you only need to let off the gas to slow down! :CWL:
I took them off before getting them dirty, so I can't comment on the off-road performance but would...
My 2 JKs and the JL all had the STT Pro on them at one time. Awesome MT tire! It was a beast on the trails. They were heavier, a little louder (and grew as they wore down) and a little harder on the MPGs than the Hybrid ATs. They got a little squirrely on wet pavement but not as bad at the...
81.9 lbs according to Nitto.
I replaced 37x13.50r17 Mud Grapplers that were E rated and 97lbs each. My King shocks do a good job of isolating the tire from the suspension, so I didn't notice much with the sidewall stiffness. Weight and tread pattern changes were immediately noticeable.
38x12.50r17 Nitto Ridge Grappler is C load. Just put them on my Gladiator.
https://www.nittotire.com/light-truck-tires/ridge-grappler-light-truck-tire/