I believe you are referring to the torsion axle
. You can not reset them. The rubber in the tube wears out and allows the trailer to sag and provides less height and protection from all those lovely potholes.
We are going to start removing the body of my Trillium
today. I found a welding shop nearby to order and replace the old axle
. They were referred to me by the RV place. This person kept insisting I should just leave it alone but it leans and they are worn. He wasn't even going to have me remove the body. I remember long time ago where someone had their axle
replace and burned up the trailer.