6 jack hydraulic level up. Have had one side off the ground many times camping and all 4 off the ground while Lippert service rep waited for a replacement part for 5 days. Have used the jacks for 5 tire changes at different time all on a 16,000 pound 5th wheel. Probably leveled several hundred times. No problems related to the jacks but did have one board die a month after they where installed which was sent to me next day air.
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