I just had Aluminess install a Bike Rack swingarm on my van so I no longer need this. The Deluxe box has a shelf installed at a height that should allow a generator to fit below it. The expedition kit is included. The shovel & axe were stored in the garage when not travelling but the black shield on the axe is peeling off anyways.
The box has Thule tracks built onto the top. Aluminess didn't like the way SMB installed the box reinforcement so they fixed it on one trip I made to their shop. It is pretty solid and works well. I do have some of the Thule hardware to fit on the tracks but I had a failure recently that bent the parts of the mounts that fit into the trays. Those would need to be replaced.
The swingarm is for the E series rear bumper. Measuring the inside distance between the swingarm hinges is very close to 24" so your setup would need to work with that. Pretty much no hardware is included so all of that would need to be sourced.
Pictures can be found at the link below. I'm thinking $800 for all but I can also sell the box separately if needed. I'm located in San Diego and can likely meet as far North as Lake Forest if needed since there is a good cheesesteak shop up there.