Could be springs are too stiff for the weight of the load. At specific speeds, you would get a harmonic effect leading to the bounce. At higher/lower speeds, the problem would disappear.
I have seen this at 45-50 mph when my trailer had 2000lbs torflex axle with an 800 weight...going above or below by 5 mph stopped the bounce. Swapping the axle for a 1000lbs unit completely cured it.
Mike.
Nacra 5.5 on a four yr old galvanized trailer, all in good shape. arround 10 to 15 mph the whole trailer seems to hop or bounce. Slower speeds or faster speeds no problem, only issue is at 10 to 15? Any ideas why?
The trailer does have a bit of a long tong(if that is what you call it). Dealer suggested I cut it down if I want but I have not scene a need to shorten it.
