Installed a vent in ours; note it's stick and tin. As per earlier post mark from the inside the location, and drill pilot holes from the inside out. I added a step to cut open the inside wall to look for obstructions. Located wiring that I had to consider when cutting the hole from the outside using a jig saw. To protect the surface I placed green painters tape outside my cut line.
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Mike and Brenda
TV - 2013 Silverado 1500, 5.3L
TT - 2012 Wildwood 26 TBSS