I suffered through a King Jack and even had to repair it when an internal cable pulled apart up in the head. This requires removing the entire outside portion and replacing the cheaply made Chinese cable or repairing the very bad male end of the only foot long cable.
This was only an encouragement to sell that trailer (other reasons of course) and now have a good old Sensar with the Wingman again.
Look at the Winegard automatic one if you have room. It is not cheap, but, I almost went that route.
Charles & Martha Myatt
2009 Duramax w/Transfer Flow Fuel Tank
2016 Flagstaff V-Lite 30WFKSS
Almost South of the Border