I did something similar to a previous Toy hauler I owned. The bedroom slide only had a window on one side. I ordered a window to match the existing one. Made a template and screwed it to the wall, and used a router to cut the hole, just through the wall covering on the inside and outside. There was aluminum framing going up through were I cut the hole. Sawzalled it out, added some blocking and installed the window set in silicon. Looked like it was supposed to be there. Never looked back and traded it in that way.
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2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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