I have a Salem Hemisphere and the rear stablizers are not working as I would expect. Since this is our 1st RV I'm not certain about how they should operate. Anyway, when I put them down they do not go down together all the time. Sometimes one starts down and moves 2-3 inches before the other starts. Of course we are not always on level ground and sometimes one goes down further than the other ( I do try to block to the same height for each). How are these things suppose to work??? When I retract them, 1 almost always get one that's up before the other; is this normal?