A square piece of 1/4" plywood flat down in the bottom of the cart for a gun butt tray and accessory box to sit on.
Another box on top held in with slide door bolt locks. That has the long gun barrel cushioned divider on.
Lower box has lower section for extra ammo etc and a double hole in tray for pistols and days ammo.
Wood parts break down to fit into a large storage bin for transport.
This cart started out from a Baby Trend three wheeler.
I made this before the Rugged Gear carts were available.