Oh a fun day...was sitting at a campground with the levelers down..they are the HWH with the springs....the system would not retract the levelers..I opened the T-handles, still no retraction...I ended...
dougrainer's comment is correct. I had this problem last March, and found our shuttle valve was bad. Removing and reinstalling the valve will temporarily relieve the pressure so you can retract your jacks, but get the valve replaced at your earliest opportunity to prevent the problem reoccurring.