Here is an example for the 2619. Power Lift/Level Jacks are the last item in the options list. Sure enough, it sounds like the jacks are for lifting and levelling the trailer. At about $475 each they are 'spensive little guys! On the other hand, there is a system called PowerPlus that appears to put an electric motor on our standard scissors jacks - and gets $4k for a set of 4!
http://trailmanor.com/WebDocs/Showro...uild2619KB.htm
Bill