As most know we had a Cambridge 358 and it was the heaviest 5th wheel we have owned. When I had to replace all the Aluminum wheels I put the bottle jacks under the spring hangers and raised the one axle at a time and always use jack stands. I really don't think I would put the jack under the frame, just my opinion. However I don't have that problem anymore, we now have the hydraulic side to side leveling system and it will raise the 5th wheel off the ground, however I will still use jack stands. GBY....
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