This is only feedback and I am not telling the devs what to do, this is something I would find fun in the game, even if it comes in game later this year or next.
You start with buying the a stock truck. Then you can sacrifice the stock truck for a small lifted truck of the same kind. And repeat if you want the the hugh lifted truck. So to own all of the same trucks,Small lift, and hugh lifted one and then the stock truck you would need to buy that stock truck 3 times.
So if the stock truck was 10,000 skell = this would remove 30k skell from your game.
The small lift would be 1k skell = so this would cost in full 11k skell = 10k skell for the truck and 1k for the small lift.
The hugh lift would be 4k skell = so this would cost in full 14k skell = 10k skell for the truck and 4k for the hugh lift.
You could add armour up plating for your trucks and buggy so bullets wouldn't take them out as fast. This I don't really care about so much as I do the lifted trucks.
And we need some diesel trucks that blows black cloud of smoke. that big Rt-5 Shepherd kind of does this.
When you don't feel like killing because you have put tons of hours in the day and feel like playing around. I think they did awesome on this off roading.