Fridge in the bed?

I've had my fridge mounted in the back seat of my 4dr Tacoma for years.
Its a small PIA to load the fridge and get items out, but its been "do-able"
I just bought an ARB slider thinking I would mount fridge to slider but it won't slide far enough out the door.
Plan "B" is to mount it in the bed, but even with an ARE cap I still get a lot of dust/dirt in the back.
I was thinking to mount slider in rear left corner by the OEM storage box after cutting the rear deck down to fit fridge.
Anyone else mount their fridge in bed of the truck? And issues with dirt?
Post up pictures of the fridge mounted in the bed
Thanks

 

@Acerwin