When we had a TT, I always removed the foot and retracted the jack as far as possible. You never know when you might encounter a dip in the road that suddenly lowers the hitch and digs the jack into the ground. Been there, done that.
2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
2004 Jayco Designer Medallion 29 RLTS 5th wheel
Bill, Gayle, and Mindi (dachshund)
Retired at last !
Nothing is foolproof to a sufficiently talented fool.