Post nuclear, cyberpunk, real time strategic combat in the radioactive wastes of the near future.
Modularity is a recurring theme in futuristic technologies and the same applies to vehicle design. Pared with functionality and you have the pinnacle of logistical simplicity and capability.
Each faction has a standardised truck base in which other functions are built upon, currently this is harvesting and transporting goods but can also be used in offensive and support roles.