Something to think about Joe,
Some users might prefer skid bars over plates.
The design posted earlier (the VX 'jockstrap') while looking very protective, also looks like a PITA to clean mud out of.

Maybe you could fab up a protective cage, that a plate could be welded over/bolted on, if the buyer wanted it. That would cut your fab time down, save on shipping, and give the user an option to change materials (like my plastic) if they desire.

Just picture a ladder (with smaller rungs) under the truck.