Composites are being preferred by many manufacturers over steel and aluminum for many reasons. Composites are corrosion resistant. The material can endure heat and chemical exposure. It offers a fascinating weight to strength ratio, although the quality of the material will vary depending on the design and manufacturing process. It is lighter than aluminum and much lighter than steel. Yet, it is strong and durable. Composites, if made well, can easily last decades. They can be used in a myriad of products, not just structures but also functional trailer parts.
Composites are more flexible than steel and aluminum. Hence, you can explore a whole new spectrum of trailer parts made of such materials. Many manufacturers are experimenting with composites beyond the obvious realm of trailer parts and other automobile spares. Large scale applications are also being tested, from boats to bridges. Composite materials do not rot, they do not rust and there is little effect of weather extremes. Trailer parts made of composites require little to no maintenance. They are also good conductors.
While the benefits are noteworthy and reason enough to consider the material, the limitation of application is real in some cases and that should be acknowledged. Not every type of part or accessory will be better off when made of a composite material. The manufacturer also needs to ensure the product meets the local guidelines, including some stringent regulations that usually pertain to trailer parts. The quality of composites also varies due to different designs and manufacturing process. Not all composites will be equally strong, durable or resistant to corrosion, rot and rust, efficient in functional parts and ease to maintain.
Just as you will compare the strengths and weaknesses of steel, aluminum and other alloys, you should assess the pros and cons of composites while shopping for relevant trailer parts.