There are several types of overland drop trailer suspensions available, including air ride, leaf spring, and torsion bar. Air ride suspensions are the most popular type of suspension for overland drop trailers, as they provide a smooth ride and are adjustable for different loads. Leaf spring suspensions are also popular, as they are durable and provide a good ride quality.

Torsion bar suspensions are less common, but they offer a good ride quality and are adjustable for different loads. All of these suspension types can be used for overland drop trailers, depending on the specific needs of the trailer.

Overland drop trailers are typically constructed with a steel frame and exterior finishes that are designed to protect the trailer from the elements. Common exterior finishes include galvanized steel, aluminum, and fiberglass. Galvanized steel is the most common finish used on overland drop trailers, as it is highly durable and resistant to corrosion.

Aluminum is also a popular choice, as it is lightweight and provides good protection against the elements. Fiberglass is a less common choice, but it is still a viable option for those looking for a lightweight and durable finish.