Whether to choose an aluminum or galvanized steel trailer depends on your usage needs. Aluminum is water resistant, lighter and less prone to corrosion than steel. Galvanized steel is carbon steel dipped into zinc to coat it. It can be heavier and is typically more expensive. However, thinking through your hauling needs, you might consider one over the other. For example, an aluminum trailer would be ideal as a boat trailer for fresh water only. A galvanized trailer rental could be used for more industrial, heavy-duty hauling for a construction or building site.