I will start with some pictures of the beds of Gen 1 M-ATV's and the modifications that were made to them. Due to lack of interior stowage in the M-ATV, all ammo and equipment had to be stowed in the bed or, if they had them, in turret bustle racks. This lead to crews fabricating walls for the bed so they could better pile their gear in the back.
I saw many methods trying to do this, but the most common was plywood, cammo net, and HESCO barriers as those materials were the most common and easiest to work with.
Brand new M-ATV, one of the first in country with no modifications.

This belongs to an RCP, this one has plywood.

From the same RCP, this one has a unique custom metal walls with built in door. Only one I ever saw like this.

One of our trucks with Anti RPG netting and Camo netting wall

Our local ETT Teams trucks all had plywood bolted to the outside

Same truck as above.
