Build a map with trail riding and rock crawling in mind. And add a lift kit option to the 4 wheel drive truck and bigger tires for crawling and mud. Also add more power as the truck stalls on steep hills where it really should not.
Would you like fries with that? But seriously, this might happen one day, bigger issues right now. Maybe a community member can do it...?
I don't mod, so can't do anything about the truck, But experimenting with map making at the moment. Maybe I can make my own.