rvdogmom40 - I'll try to get this question back on topic. I doubt there is a rule of thumb on when you should replace the shocks. Sitting on a dealers lot for 4 years would not automatically mean the unit needs new shocks. Driving on the Indianapolis speedway for 30,000 miles would not mean you need new shocks. It most likely depends on what type of climate it has seen (salt air rusts, hot air dries out seals, etc.) and type of roads encountered. The rougher the roads the more abuse the shocks have dealt with. I replaced my front shocks with bilsteins way too early, saw no improvement in ride - it still rides great. Use your "seat of the pants" feel as your guide. Does the unit do more bouncing up and down after encountering a dip or hump in the road? That is what the shocks are supposed to do - stop the up and down motion of the RV. The old method of bouncing up and down on the bumper still is a good test, just a little harder to get bouncing enough.
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