Securing a Removable Galley

I'm working through some design ideas for a 4' x 8' teardrop, and one of the features I'd really like to incorporate is a removable galley. This way the tear could function as a covered cargo trailer whenever I need it. The trouble I'm having is figuring out the best way to secure the galley when it's in the tear. I came up with this idea as a quick and easy way to bolt the galley to the walls and floor, but I'm not sure if such a bracket even exists.

Basically the bracket is inset flush into a plywood side wall or floor (similar to a striker plate), and it is secured in place with 4 screws in the corners. The center hole is threaded to accept a bolt, and the bolt would pass through some part of the galley frame to secure it at multiple points to the tear frame. Does anyone know if a bracket like this exists, and if so, what it's called? If not, do you have any ideas on some other good ways to attach the galley to the frame?
Thanks in advance!
-Robert

Basically the bracket is inset flush into a plywood side wall or floor (similar to a striker plate), and it is secured in place with 4 screws in the corners. The center hole is threaded to accept a bolt, and the bolt would pass through some part of the galley frame to secure it at multiple points to the tear frame. Does anyone know if a bracket like this exists, and if so, what it's called? If not, do you have any ideas on some other good ways to attach the galley to the frame?
Thanks in advance!
-Robert