Fitted security grills to rear windows. Just the lock to upgrade now :D
Made a fold away shelf attached to rear door for cooking on. The brackets drop down and lock into position until released. The brackets are rated for an amazing 200kg of load, but I do not think the rear door is! Plenty stable for cooking on anyway.
Normally just use the front wings to brew up on, but this provides a cleaner alternative with a little more shelter. Can rig a tarp (or place umbrella) between roof and door top when it rains. Shelf should be wide enough for a double ring stove with the bottle stored inside corner or on roof rack holder.

Set at this height so the door can be temporarily closed (or blow shut) without disturbing the brew.

Tinted windows at rear for security and to keep sun off dogs.