On my front landing jacks there is a spring-loaded pin that, when removed, allows the inner portion of the jack to slide up and down, so you can make it "longer or shorter". Before you lower or raise the 5th wheel, do you make any adjustments like this by extending the inner portion of the jack?
Before unhooking, I often run a few inches of the landing gear out (depending upon the incline), pull the pin on the jack, lowering it to just above the block/pad, re-insert the pin and then extend the jacks using the motor.
You should also be able to make adjustments in your hitch to raise or lower it. In your case you might need to lower it but make sure that there will still be enough clearance between the truck bed rail and the 5ver. There should be approx. 6" clearance.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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