Steve,
Welcome to the forum!
Your front jacks obviously maintain a load on them anytime you are not connected to your truck. The other jacks are rated to lift the rig also. If you are really worried about it you could use some good jack stands to keep your rig up and then retract the rear hydraulic jacks.
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Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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