Auxiliary power in bed

Hello all!

Currently, the only thing I am powering from the bed is my ARB fridge which is listed as 10ga wiring. ARB states the fridge consumes .89amps/hr on average. In the next week I will be adding a diesel heater to the arsenal to run during the cold nights which appear to draw around 1amp/hour once running per online forums. I am wanting to do some consolidation and run a fuse block to the bed of the truck so I can run plugs for the fridge and heater, as well as one of the Amazon outlet panels. I have seen people run anywhere from 4ga to 10ga wire from the battery to their fuse panel in the bed, and I have seen some run an inline fuse on that wire, and some wire a 100amp breaker close to the battery. I guess I am looking for advice to see if I can get away with the 10ga wires already being used for my ARB fridge to power the fuse block, or if I should run a larger size, and if I should put a fuse in-line or run a breaker. Thanks for the help in advance!