Those E rated? I like the tread, want C rated though.
You really won't notice a big difference between C and E rated if you run the psi that suites your ride. I mentioned in another post about running E rated tires on my Jeep Rubicon and it originally came with C rated, I just ran them at a lower psi and checked the tread footprint using chalk. The sidewall height is the same for both and with the weight of the Raptor over a Jeep I would think you would not notice. With an empty bed I would just run them lower than the front and air them up if your loading the truck up
With the majority of 35" tires being a E range there are a ton of them on Jeeps since it really is the only option in some manufactures and I have talked to many owners who said it improved the ride quality due to less sidewall flex and it made the ride feel more stable
If you read the reviews on TireRack for the Cooper Discoverer AT3 XLT you can see the 50 reviews on the tire mounted on different trucks. You can check the BFG KO2`s in the 315x70x17 C and E there are 589 reviews. The 35x12.50x17 only drawback is they have raised white lettering, I mounted mine facing inward and blacked out the white lettering