I did this for one side at a time with our old hybrid, and with our old pop-up when I had to replace a leaf spring, so I don't see why it wouldn't work with both sides.
Make sure the trailer is parked on a flat firm surface. Lower the tongue jack all the way so the tong is near the ground. The rear of the trailer will be pointing up. Put an axle stand behind the rear wheels under the frame, as close to the spring mounts as you can. Then raise the tongue jack up again. As the front of the trailer lifts, the rear will start to rest on the stands and the wheels will lift off the ground. Put two more stands in front of the wheels under the frame as close to the spring mounts as you can. Then lower the tongue jack until the weight is resting on the stands. I've never done it for both sides at the same time, but it worked for me doing one side at a time.
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Geoff & Jill
& Sierra, the little white monster
2013 Ford F-150 XTR SC Ecoboost
2015 Jayco Jay Flight 24FBS
Winnipeg, Manitoba
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