We have a 2014 White Hawk Summit Edition 27DSRL with a 3/4 full hide-a-bed. Not sure if it's the same size as the jack knife. My DW bought a 2 inch thick memory foam topper, sewed it up nicely in a duvet cover, and with this added, full size sheets are a nice tight fit. Not positive, but seems I recall the dinette is the same size.
Cheers,
Greg
|