I have a ranger 2 and recently re-wired the stock lights back into working order. I looked at opening up the sections so I could just use my truck lights, but a couple things I found,
i have some pics on here in a post a while back you can see the design.
1. if you cut out the old lights you actually only access the inside of the camper and then would have to modify the bench inside the camper to see your truck lights and then somehow close the gap from the outside air
On the other side if you have a furnace and the fridge area to deal with , it seems like it would take a lot to modify the structure to do this
I think it could be done but I believe it would involve cutting into the frame of the camper. It is much easier rewire and and have reliable plugs/connections and use the factory lights imho.
Good luck
Chris