faye, it sounds like you have a spring return style leveling jack. It could be that the spring is weak, the piston needs cleaning, the jack is bad or the hose feeding it has a kink in it. If you are going to be running the refrigerator the coach needs to be level. Otherwise, it is a personal preference as to putting jacks down or not.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7