My initial suggestion would be (as I listed in Rebalance: Tool Qualities) to have some tool qualities tied to static locations. The most obvious being vehicle frame repairs (among others) requiring welding qualities restricted to stationary workbenches
Also making it possible for heavy vehicles to get stuck when they go off road (encouraging using light scout bikes that can’t function as mobile bases), and adding seasonal challenges like snowed in or iced over roads. And dirt becoming mud during rain making it easier for heavy vehicles to get stuck
I think the NPC Factions could also add value given time