I had the same problem with my 2015 Palazzo. I called Thor Tech help but all their suggestions didn't work. I ended up getting road side assistance to get the slide in. Now it is back at the dealer for repairs. That large slide is a design flaw. They put the washer/dryer, stove, sink and sofa on that one slide. It is too long and too heavy for the motors. The weight throws the slide off balance and the two motors get out of sync.
Did you get yours fixed?
__________________
|