My 120V electrical plans have been to 1) Get Ac from outside the van to inside, and 2) Distribute the AC inside while maintaining the ability to have most modules (furniture ) be removable.
To get the AC inside, I installed an outdoor electrical box with a male 15A AC plug receptacle.
The wires connected to this plug are routed, via a waterproof set of fittings, to the inside wall of the van
(Wheel well box not in this picture... easier to see what's going on. The blue flex conduit is visible thru the hole in the van column. One of the threaded rods that holds the top floor to the bottom floor and metal van floor is also visible)
The outside plug is wired directly to the AC outlet built into the plywood wall pictured above.
The orange plug and wire are attached to the outlet that you can see on the metal column at the rear of the van. From that box, another wire, routed through flexible conduit goes over the top and down to the rear column on the passenger side of the van. Since this picture, I added a short, circuit breaker cord to the circuit to protect all the wiring past the feed through outlet.
The white plugged wire goes forward, (after the added circuit breaker cord) to an outlet mounted in the plastic shroud at the base of the B column behind the drivers seat, then across to a similar outlet in the passenger shroud.
On each wheel well box, there are outlets at the back corner to offer AC at the back, and to outlets mounted on the front of the wheel well boxes. These outlets provide AC inside the couches that will be located over the front section of the wheel well cover. Each couch has an AC outlet box at the front of the couch attached to a short extension cord that is plugged in at the front wheel well location. That provides AC outlets at the front of each couch. Because the outlets are attached by short extension cords, when a couch is removed, the cord is simply unplugged.
All the pluggable cords are very short (under 6') and the 3 wire cords are all 12AWG, so any outlet in the van can easily provide 15A of AC.
The only items that use AC in the van are: 1) a small space heater, if needed, and 2) the Engel refrigerator, which usually is running on 12V DC but auto-switches to AC if AC is available. With everything else running on DC, I feel that the AC outlets built in are more than adequate.