It sounds like you have shocks like the Lippert Components Bolt-On Shock Kit # LC281281 on just one of the axles of your tandem axle trailer. If that is the case, adding a kit to each axle will absolutely help improve the ride of your 5th wheel trailer.
Putting this kit on both axles is going to allow for more absorption of vibration and road shock than having shocks on one axle; it will absolutely give you a more comfortable ride compared to what you have now.
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