Greetings from Colorado!
Not a closeup of the fuse box/wiring per se, but an overall view of how I handled my utilities. I grouped evrything at the foot of the bed wirh access via a hinged panel. I don't have to access this area very often, so felt that this was a good option.
This area is set just behind the axle and as low as I could get it without dropping below the level of the floor. Keeping the center of gravity low and close to the axle helped the balance and handling.
I brought the 110v into the trailer and directly into a GFI outlet. From there, the wiring goes to 3 other outlets. One in the cabinet over the bed. One in the nose of the trailer and one in the galley area. I very seldom use the 110V but wanted it available. I do have a 12V float charger plugged into the outlet in the utility area outlet all of the time. This way, I can simply hook power to the trailer while it is in storage and the batteries are maintained.
The charge lead for the batteries comes through the wiring harness form the tow vehicle. It is a 10 gauge wire with a 30 self resetting circuit breaker on the tow vehicle end. The power is automatically connected/disconnected when the key is turned on/off. This way, I keep my tow vehicle/trailer batteries isolated [seperated] from each other just in case there is a drain on either one.
The 12v comes into a fuse block and from there it is distributed to the various circuits through appropriate sized fuses. Without looking, I beleive that there are 6 circuits. Lights/front 12v outlet & stereo/water pump/ceramic heater/galley 12v outlet/12v outlet above the bed/and ?. The ground is attached to a bus bar [plastic strip with multiple screw contacts] and each circuit has it's own ground connection from here.
There are 3 lights in the cabin. Two run off of one switch and the third off of a another switch. The two lights in the rear of the cabin are positioned over two drawers so the contents can be seen. There is a single light above the head of the bed for general illumination. Between the head of the mattress and the front cabinet wall are two gooseneck reading lamps that can be pulled up independant of each other. They are out of the way when not needed but provide selective lighting when one persom wishes to read and the other wants to sleep.
There are four lights on the galley hatch. They are wired in pairs and can be used with two or four lights, depending on how much light is requried. I mounted the lights overhead on the inside of the hatch so that the lights were not in your face/eyes when they were on. The lights are operated by a VW headlight switch mounted in the galley bulkhead.
The stereo is positioned above the bookcase at the head of the bed for easy access. There are four speakers. Two under the cabinet above the foot of the bed and two under the window above the closet at the front of the trailer. There are also speaker jacks in the galley area. When speakers are plugged into these jacks, they disconnect the speakers above the foot of the bed. There is a 12V fan above the head of the bed to move air on those sultry nights.
For exterior lighting, there are four clearance lights, 2 amber on the front and two red on the rear. I can see thease when backing up and it sure helps at night! Two taillights mounted on homemade conduit stalks and a third brakelight mounted above the license plate light.
To provide a good, solid ground, a separate ground wire comes from the tow vehicle and is attached directly to the frame and to the buss bar located below the fuse panel. All circuits have a dedicated ground wire and the taillights are grounded to the frame.
Way more information than I planned to post, but I hope that it gives all some food for thought....