Our system is a bit simpler than most of the boxes shown here. I usually prep/cook food on the tailgate of the Tacoma or on a picnic table. The box is a Centrex Plastics "Commander" 27 gal tote. This box was the only one that I found that would fit our Primus Profile Duo stove/grill. The rest of the box was built around that. It holds the stove and griddle, 2x Propane Bottles, select pieces of a Stansport Nesting pot set with mixing bowls, plates, and bowls inside, a 10" GSI Pinnacle frying pan, spices, and cooking utensils / flatware. There is some empty space that can be used for dry/canned food storage on short trips or to hold the "on-deck" evening meal on longer trips.
The dividers and tray are made from 1/4" plywood glued and nailed together then covered in several coats of polyurethane. The dividers are not permanently attached to the box, with the box loaded they stay in place fine, and they could be easily switched to another box if this one cracked or broke. So far it has survived a two week road trip and several weekend trips and looks none the worse for the miles.