I'm not sure if this is still valid. The old timers check is to push down hard on each corner. If the corenr rebounds to its' rest position and then stops, all is well. If it moves up/down any additional times the shocks should be replaced or at leased checked.
In addition, if your tires have some miles on them and there is even wear, the shocks should be in good shape.
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
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