Appears to me to be the same as the reward truck ya get for liberating Copperhead Railroad Yard out post (called a 2012 Kimberlite TC6 M-Duty "OUTLAW") save for the camo paint scheme - looks like a FORD. Although it appears some of smaller square fronted cult smaller single bench seated PUs look like CHEVYS, and the off road custom jobs appear to be based on TOYOTAS......
I'm guessing they (FC5 folks) did not play favorites and garner'd their vehicle looks from most major auto brands then altered aspects of them to avoid entanglements legal wise from the car and truck companies.