Yep I did this last month. Ran two 6mm wires to the back for the fridge. I picked the power up from the B+ in the fuse box and put an inline fuse in there also. Took an hour or two
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If I were you I would ( and I did) put in a 4 AWG wire in case you want to put more stuff in later.
I also have a 300watt inverter run through an anderson plug , and my compressor which connects to the same plug. Reason for compressor to rear is the camper trailer tyres.
Obviously with a 4 AWG , you cannot tap from the fuse box. I have reversed my batteries and the accessory battery is in the first position.
Jaycar do very good maxi blade fuses in clear covers and I have fitted one to the rear of my under bonnet fuse box.
I have run my cable along the RH chassis rail completely covered with split tube.
Regards Philip A