As Gary states Rubber suspension is self damping and you are basicaly adding additional damping slowing the rate the wheels return to their normal ride height.
in my eyes this would give a harder ride with low or no weight in the trailer that would make it bounce around more.
However I have come across some one that used an Erde 153 trailer regually and he had a poor ride at around 50 mph with approx 1/2 - 3/4 of its load capacity. it was fine to tow empty and full weight. he fitted Shock absorbers and it cured the problem.
I recomend if you have a problem with the ride on normal roads at any speed 30mph or above then it could be worth trying.
This will not cure an empty trailer bouncing on the air over speed ramps.
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Topic: Erde Shock Absorbers
