If you bought the trailer new then you should read the manual for the stablizer jacks. It will tell you what you can do and what not to do. It may surprise you. Either lift in front of the wheels or behind the wheels, between the wheels is a pivot point that may not be able to handle the stress of lifting.
2011 jayco 33rlds, 2002 Ford excursion, v-10, 3:73 gears 4x4 mine. 2008 Suzuki sx-4, hers. Retired Air Force, now Retired.