Can't go wrong with an 1-1/2" screw. Walls are roughly 2" thick on a Jay Flight. Studs are 1-1/2". I had got a good measurement when I removed all 9 of my windows to do a reseal / reset last year. 1-1/2" stud, 1/8" interior panel, 1/8" luan plus filon on mine. So a little less than 2". Either way, 1-1/2" should be fine. If that's too close for you, go 1-3/8" or 1-1/4".
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John and Rebecca Dickson
Emma-13 / Little John-10 / Iva-7
2013 Ford F-350 Lariat FX4, CC LB PSD, DRW
2015 Jayco Jay Flight 28BHBE (#8)
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