Hello Salda01,
Jacking up the total unit makes me nervous. I would just do one side at a time.<?: prefix = o ns = "urn:schemas-microsoft-com

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And then where do you jack it from? The RV center said to NEVER jack your RV on the axle; ONLY from the frame. I guess they feel that the axle is thin enough to damage. Of course, they did not say where on the frame.
This is what we did:
We jacked up right rear wheel from beneath the spring U-bolts, then removed the wheel and put on the spare. Moved the jack to the front axle U-bolt and jacked up the front right wheel and removed it.
We sanded the rims and painted then with Krylon fast drying paint and took the 2 wheels to the Tire Center to have the tires and valve stems replaced and the wheels balanced. (The folks at the tire center were great!) We ran the two new mounted tires home and placed then on the RV and started on the left side. By mid afternoon the RV had 4 new tires and good looking rims.
I did not have to worry about it falling off the jacks or moving the propane pipe.
However you decide to proceed; be careful.
With highest regards.
Kamper Dave