If the 13" dimension is the width, you probably could do that since most campers have studs about 16" apart. If 13" is the height, you would be cutting studs and would have to frame it such that you would be supporting all of the cut studs. Kinda like making a header in a house, if you installed a new window or door in a wall.
If you can, get construction drawings. Remember, measure twice, cut once!
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2012 Cedar Creek 36CKTS Touring Edition
2015 Ford F-350 CC DRW Lariat
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