Most of our stuff is powered from 12volt, so we don’t have much need for 120.
Things like computers and MiFi are the exception. We use these almost exclusively in the rear of our MB. So that’s where we wanted 120volt. We asked for an outlet there when the rig was built and were turned down.
What follows is a how to specific for MB’s. I have no idea how or if it could be implemented on any other floor plan.
So for both of the people that 1) Have an MB, 2) Want a 120 volts in the rear and 3) Are willing to take on a fairly simple DIY project 4) You do not make the beds into a King - read on.
I mounted the inverter on the wall behind the drivers seat. That was unused space and it is close to the batteries. I used a cheap 1000w inverter from Harbor Freight. It has the same case as the one used by a well known brand and may have the same internals. A hole was drilled through the wall panel behind the drivers seat and another into the battery compartment to run #2 wire to the batteries. I sealed the latter one. The former can not be seen.
I cut an extension cord using the male end to plug into the inverter and ran the cable through the same hole in the panel used for the cables to the batteries. Remove the interior panels in the cabinet under the refer. [Mark each panel so you will know how to put them back. They are not cut square] Make a connection from the extension cord to #14 standard house wire. You want to use this as the stiffness will make it easy to snake the wire to the back of the rig. Do observe correct polarity.
Snake the #14 back over the fresh water tank. There is a small opening in the “wall” to the bath. Use a small child for this. Remove the panel behind the toilet that covers the plumbing and snake the wire through there and through the panel wall behind the shower. Attach the female end of the extension cord you cut and secure it with P clamps to the forward end of bed platform and terminate it adjacent to the factory 120volt outlet in the “hall”.
Mount a power strip in the middle of the rear wall near the top of the carpet. [No holes to show] Run the cable from the power strip under the driver’s side bed to where the wire from the inverter terminates.
When boon docking you plug the cable from the power strip into the wire from the inverter. When on shore power you plug the wire from the power strip into the factory outlet.
Pretty simple actually.