I need some ideas on securing a Dynasty 200 and the 211 (I hope to get soon) along with a gen set in the back of a Bronco.

I put a slide in it today. The surface is 3/4 marine plywood with marine carpet.
It works well and gives me access to the entire back of the truck (rear seat removed)

I would like to have some way to keep things where I put them and deter theft as much as possible. I haven't figured out how I'll tie down the Dynasty or the Mig other than a simple strap over the top.

Maybe some type of frame made from aluminum that locks? Hoping for some pics and ideas.