Do we want a generic "standard" truck or one that has bolted on armor, spikes and skulls? If the world collapsed tomorrow, a generic truck would be cool. If it's been 5-years into a collapse I'm thinking the ones, if any, that have survived and collected by local warlords would be modified with armor plate (to stop small arms but useless against even light AT weapons). If by generic you mean a "generic weapons mount" to hold an HMG or multiple rocket launcher or mortar or AGL or possibly a chain gun, then yea, that's sounds cool. I think it would be easier to take a (Ford, Toyota, Nissan, Dodge, etc.) truck, slap some armor on it, and call it a day rather than have to wade through patents to make sure our fenders didn't match up too closely with one of the big auto makers.
And, while we're on the subject, what about armored busses? Short bus with armor plating and a weapons pit on top. Full sized school bus with armor plating, a couple of weapons pits (fore and aft) and vision slits/firing ports on all of the windows; maybe a big cannon mounted next to the driver?
Former Director of Product Development, Research and Design