I need some help trying to figure out what to do next to try and solve this shake in the trailer. I have a single axle trailer with surge brakes, 19.5' foot boat. At 63 MPH a shake starts and it gets extremely heavy at 70, then smooths out again towards 80 (I basically have to drive at 65mph or slower at all times). I have tried everything I can think of to get rid of the shake. Everything I have done has not changed the behavior at all.
What I have done, in order:
* Tires Balanced
* Paid to have bearings gone through, at the time they said bearings were good and just repacked them (2 years ago, I have little faith in the place that did it).
* Tires re-balanced (threw a weight)
* Personally went through the bearings. Drivers side had a little play but was in good shape. Tightened up and no play when I was done and rolled smooth and quite. Passenger side was in bad shape. Replaced bearings and races. (today)
* Replaced the drum brake spring on passenger side (was broken, shoes looked okay)
* Borrowed 2 brand new tires (still had the stickers on them) and put them on, no change.
I'm out of ideas. I can't say for sure if the surge brakes work but I know they aren't dragging when its up on the jack stands.
Anyone have any suggestions on what to do next?
What I have done, in order:
* Tires Balanced
* Paid to have bearings gone through, at the time they said bearings were good and just repacked them (2 years ago, I have little faith in the place that did it).
* Tires re-balanced (threw a weight)
* Personally went through the bearings. Drivers side had a little play but was in good shape. Tightened up and no play when I was done and rolled smooth and quite. Passenger side was in bad shape. Replaced bearings and races. (today)
* Replaced the drum brake spring on passenger side (was broken, shoes looked okay)
* Borrowed 2 brand new tires (still had the stickers on them) and put them on, no change.
I'm out of ideas. I can't say for sure if the surge brakes work but I know they aren't dragging when its up on the jack stands.
Anyone have any suggestions on what to do next?