Advances in Boat Trailer Materials and Technology

Boat trailers have come a long way. What started off with round axles, and more recently galvanized square tubing, to resist the corrosive effects of salt water. Springs have always been made of spring steel that could not be galvanized because the springs would crystallize, making them brittle as glass. Springs are now mostly a thing of the past, frames are primarily aluminum alloy, and the fastener hardware is stainless steel. The hubs are galvanized and the lights are now LED. Wheel bearings last longer due to upgraded technology, including better lubricants and seals with the ability to keep out saltwater. A much-upgraded package all the way around.

Torsion axles are now the most common suspension system under boat trailers and they are virtually maintenance free…to a point. While torsion axles may not need new springs, they do have a life expectancy in salt water, normally seven to eight years. The middle section of the torsion axle tubing has a slight dip that will hold saltwater, which eventually eats through the galvanization and weakens the axle. Washing the boat and trailer will usually not get to this area unless the owner puts forth a specific effort.  

Another little known aspect of torsion suspension is that the trailer may begin to sag under load as the rubber inserts that anchor the torsion arm to the axle tube deteriorate over time, allowing the tire to rub the undersurface of the fender. Removing the wheel is an easy way to perform a visual inspection and avoid tire failure on the highway.   

Have a great winter season!

Chris Mapp

Coastal Bend Marine – Port O’Connor, TX
coastalbendmarine.com – 361-983-4841