Here is the list of features added by this mod.

-Players can lock gas caps if they have the key.
-Pickup trucks now have visible items in their beds.
-Zombies can (rarely) spawn inside trunks, opening the trunk will release them.
-Loot spawns fixed for several vehicle types, increased variety.
-Different wheel graphics for each tire type.

List of new parts or install options in the vehicle mechanic screen.

-Alarm: Can be turned on/off by having the car's key. *Only available for certain types.
-GPS: GPS' screen shows points of interest, player's current location and saves custom points in the memory. *Only available for certain types.
-Extra Tire: Dash Rancher has an extra tire slot attached to the trunk lid.