If you've ever played Kerbal Space Program, I see Mudrunner as KSP for terrestrial folks.
Don't be surprised if you spend three hours of your life driving 10km just to pick up some logs, only to get bogged and lose your load on the way back.
Plus there are plenty of mods available for it. I've never looked too deeply into them, but I know that there is an Australian mod pack with a bunch of lifted Nissan Patrols and Toyota LandCruisers that have huge tyres and blow heaps of diesel smoke. It's what the kids here are into now that they can't buy RWD V8 drift utes any more.