Mounted the old board from the XJ Cherokee to take my battery and fridge. I was surprised how much smaller the floor was as had to chop down both the width and length to fit. To keep the board down in place I have cut holes above the 4 tie down points in the board. Then I run a strap through them and over the board between them before pulling it down tight. This way the load is spread over a wide area to keep it secure on both sides.
I had to install a fridge slide as you could barely open the fridge before the lid would hit the roof. The floor height must be higher than the XJ so the spare tyre can live underneath. The slide was bolted through from underneath the board using mushroom headed bolts to stop them pulling through.
Having the slide does make it easier to lift the fridge in place too as well as get to things.
I found if you lift the lid right up just before reaching the end, and then fully extend the slide, you have hands free access.
It is that tight fitting the fridge in that I had to turn the rear handle upside down to fit it all in between the tailgate and the seat back.
The fridge battery I have mounted here so I don't crowd the engine bay and carry the extra 20kg around the rest of the year!
Everything is quickly removable without tools and without any modifications to the Jeep for mounting points etc.
I have the battery isolator mounted here and has auto reset fuses before going to the fridge battery. Terminated with an Anderson plug at the solar regulator.
Folded up a bracket to permanently mount the battery charger for when parked at home as it is not driven daily.