We purchased our '16 Grey hawk 29MV last week. I found this site and went out and measured my Stabilizer jacks. All four jacks have a ground clearance of only 6.5 inches. Adjusting the rear jacks would be easy with all the adjustment clearance available.
Although the front stabilizer jacks have the needed adjustment holes, there is no clearance at the top edge of the jack frame. Moving the jacks to the next hole will hit some framing up above.
I'm considering having the dealer move the rear jacks for the 7" clearance. I intend to carry some stabilizer blocks. So I know I would need to have two inches more in blocks for the rear as compared to the front.
From Cajun Country
Jayco 2016 Grey Hawk 29MV Champagne
Toad - '16 Subaru Forester (Pearl White - manual transmission)
Blue Ox (everything) for the TOAD
EEZRV TPMS System