On Wednesday, November 7, 2018 at 10:36:19 AM UTC-6, wrote:
I changed a wheel in my Cobra trailer with the glider inside. I located the Jack just under the corner between the bottom and side wall, next to the fender.
Looked flimsy, but held fine, no bending of wall or edge.
Was I lucky or is this the right place to do it ?
Dan

You did fine. On the cross member, as Bob K suggests, can end up as an awkward lift if the tongue weight is low. That point could actually be ahead of the CG, so being tied down at the front becomes important. If the side extrusion wasn't stressed for handling the axle loads, the axle wouldn't be secured to it. And you know where the axle is attached. Just don't slip over onto the floor board section, as that is pretty thin aluminum on foam, and it will compress and fail if you put a jack on it to pick up one side of the trailer. Best stick close to the outside edge of that "corner", as the tabs that the floor sticks into are about an inch and a half or so long.. And you don't want to lift by them. You want to push straight up into the sidewall. Just like the axle attach does.

Steve Leonard