I dig this.
If you had it to do again, what would you use instead of the chipboard? Does it need to be structural, or would something like greenboard sheetrock work?
A router? Unless you have a CNC router, I would recommend either a sawzall (I know everyone has one of these) or a jigsaw. Router would take a long time to make all those openings.
Sawzall = fast.
What would be really cool is put a PTO out the back of your Jeep, put a Dana 60 under the trailer, and hook it up with a double CV drive shaft. Power under the camper, now you could go anywhere and the camper would be pulling its own weight.....or pushing you when in the mud...
Just like the military Gama Goats, or Weasels....