Trailer Sways Above 40-50 Miles Per Hour

Updated 04/23/2010 | Published 04/22/2010

Question:

Hello, I have a question regarding my double snowmobile trailer recently converted to a ultility trailer by adding sides and gate. At speeds of 40 or so the trailer sways side to side. After looking into the issue I followed the rules for placement of the axle on the trailer. The axle according to my measurements is centered at 4 feet. Should the axle be mounted 32 inches from the rear of the trailer if the total measurement of the trailer bed is eight feet. Could the cause of the sway be caused by the axle being placed in the center at 4 feet where it is. I purchased the trailer with the axle mounted. Was the axle mounted in this manner because of it is actually a snowmobile trailer? Please provide some advise... Thanks

asked by: joe

Expert Reply:

If a trailer is swaying exclusively at certain speeds, rather than in response to passing traffic or gusts of wind, three possible culprits come immediately to mind.

First would be the loading of the trailer. If the trailer has insufficient tongue weight (not enough weight at the front of the trailer) sway can be caused. Try loading the trailer so that more of the weight is forward of the trailer axle. Secondly, a bent axle can cause the sway you are experiencing. This might not be very noticeable at slower speeds, but can become more pronounced at higher speed. Finally, make sure that the tires and wheels are in good condition. A bent wheel or improperly inflated tire can cause sway that would be sensitive to higher speed.

I would not suspect the placement of the axle.

expert reply by: Mike L