jrw1550 wrote:
I can only speak for my trailer, a Rockwood HW256 and the manual states to change the tire jack the camper up on the camper frame and never on the axle pr any part of the axle. I am not saying anyone is right or wrong just what mine says.
Ditto on mine.
The Suburban manual says to jack the rear by placing the jack under the rear axle between the spring hanger and shock mount. Leads me to believe that if the axle was strong enough to support a jack it would say so in the manual.
If you have leaf springs (not torsion axles) and if the springs are underslung (mounted below the axle), then I could see where placing a jack under the spring plate would be acceptable. If the springs are mounted over the axle, then you are trying to balance the jac under the U bolts which is not very stable IMO.
Remember that even though the axles do carry the weight of the trailer, jacking the axle means that the entire weight that was on that tire is now focused on a small point at the top of the jack and pressing at one point on the axle. Same reason that a skinny girl can still dent a hardwood floor with high heels.
Know the way the trailers are built, I would jack the axle under any circumstances. I use a hydraulic bottle jack under the frame rail next to the spring hanger with 4x4 cribbing under the jack to help with height.