Waterspark

If you lift by the axle end, between the U bolts, you must use a half-circle adapter. The flat top of jack could damage the thin wall axle tube. A second choice is to use a block of wood between the jack and the underside of the U bolts.

Lifting by the axle end means that a 2” lift will get the tire off the ground without tipping the trailer. Lifting by the trailer frame (as usually recommended by the axle manufacturers) means that you will need blocking under the jack to get it high enough, will have to lift 4” or more because of the suspension relaxing and will be significantly tipping the trailer towards the other side.

Rob