They're are some good reviews on both the AT and the MT.
https://www.offroadxtreme.com/engine-tech/wheels-tires/tire-review-mickey-thompson-deegan-38-all-terrain
The Trail Boss Goodyear Duratrac AT tires weight 53lbs. I know when you go to a larger heavier tire it can affect ride and mileage.
The Mickey Thompson Deegan 38 has a true diameter 33" and 34" tires that are slightly heavier by only a few pounds.
Plus Deegan is a local MX rider here in SoCal...support local!!
https://www.mickeythompsontires.com/light-truck-tires/deegan-38-all-terrain#sizes
Just bought these...Black textured and easy to install with another person.
https://www.roughcountry.com/rc-gm-wheel-to-wheel-nerf-steps-rcc1980c.html?find=2019-chevy-silverado-1500-4wd-15759