I made a full length plywood draw setup for a track trailer a few years ago. It slides on breadboard strips.
It has a steel platform on top for a roof top tent.
One draw holds a 40l Engle fridge, a jerry can with a tap and has a primus type two burner stove.
I sold the tent and never got around to replacing it so am giving away the set up.
It’s made for a track RAAF trailer.
Located Brisbane. I will try to find pics from last trip.
PM me if interested.