There is no generic approach to choose the best trailer spares. The type of spare you need, its primary function and the challenges will determine your choice. Even the options will be influenced by the attributes you are looking for. You cannot choose a material that will not survive long in the intended application. This is just one of the issues you should focus on while shopping for trailer spares.
A common complaint of most people is the expected and at times premature wearing out of usual parts. Different parts are subjected to a vast range of factors that will lead to sustained weathering. Stainless steel has widely been considered to be adequately corrosion resistant and it is strong enough to endure pressure as well as heat. But composite materials are turning out to be better. Aluminum is unavoidable in some cases when steel is a tad too heavy but it is not ideal for applications that require a stronger material. Composites are a fine balance between the two and emerge as a better alternative given its price, durability, flexibility, weight to strength ratio, heat and pressure resistance, corrosion resistance and conductivity.
You should always choose the right kind of trailer spares, be it the configuration or specification and the material it is made of. Manufacturers deal with varying grades of steel, aluminum and composites. There is no uniform quality to rely on. Some qualities may not be sufficient for a type of part you need. Some may actually fail the recommended standards. You should also opt for trailer spares that are easy to install, maintain, repair and replace. While primary materials can last a long time, many parts or components in trailers will not last a lifetime. You must find the right balance between cost and reliability, function and durability, ease of installation and prompt replacement when needed.