Original post by: Steve Meyer ,
I had Tri-axle trailer that did the same thing. When I shut the truck off it would lift the axle. But when I turned the key to the on position power when to the dump value keeping it closed. I thought it was a problem And kentucky trailer said that that's the way they designed that set up for that trailer. My current spread axle does the same thing without power. Try using the key position first before you start the truck. Mine has to be in the full on position while I have the spread up or down.