Take one out and measure it....I suspect it will be 3/4 " in length and your subfloor under the dinette will probably be 3/4 "....we owned a 2014 WhiteHawk 30DSQB....dinette was on a slide...we changed to a dinette with 2 floor pedestal supports and we found ours to be 3/4" floor and we used 3/4" screws.
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2014 Jayco White Hawk 30DSQB Summit Edition, Glacier Package
2012 GMC 2500HD Z71 SLT 4WD Crew Cab...DuraMax/Allison....3.73 Rear Axle.
2014 Chevrolet Silverado 2500HD Z71 LTZ 4WD Crew Cab...Vortec 6.0L V8...3.73 Rear Axle..(traded)
2011 Chevrolet Avalanche...5.3L V8...3.42..(traded)
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