Does Dexter Trailer Springs Over-Under Kit, Part # K71-385-00, Fit Haulmark 18-Ft Tandem Trailer  

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Expert Reply:

Haulmark produces a number of different 18-foot tandem axle trailers. This kit is applicable only to trailers with leaf springs and should be installed only if the suspension overall is in good working order. One kit is required per axle.

Please note we offer this kit for 3-inch axles and also another kit, part # K71-384-00, for 2-3/8 inch axles. Typically, 2-3/8 inch axle diameter is a 3500 lb rating; and 3 inch axle diameter is typically a 6000 to 7200 lb weight rating. You will want to confirm your axle diameter before ordering.

These kits are bolt-on, but the manufacturer does strongly recommend tack welding the new spring seats in place to prevent axle slippage. I have forwarded the installation instructions.

I have also included a photo showing how the various parts are to be assembled.

Bear in mind that lifting your trailer will result in changes to its geometry and balance; tongue weight could change and the potentially top-heavy stance could require a weight distribution system with sway control to restore handling. I have included a link to an article on weight distribution and sway control.

If you are looking to raise the trailer because it is too low relative to the hitch on the tow vehicle, the easiest and least costly solution is a new ball mount with more drop. I have included a link to our page for ball mounts which allows you to search products (using the blue sort keys on the left) for the specific amount of drop required. I have also included an article on selecting the appropriate ball mount.

expert reply by: Adam R

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