Semi trailer axles are usually made of wheels or tires that are stronger, durable steel, and have a low weight capacity. They do not come with any hydraulic system, which makes them stronger, more durable, and more durable than steel axles. Semi truck axles are typically equipped with a hydraulic system that pulls and stop them at the speeds of needing.
Pulling is primarily to prevent objects from flying off the road. They are also popular and have heavier loading capacity, making them ideal for heavy-duty loads.