When you decide to invest in a tradesman trailer for your business, you have to choose whether to buy a single- or dual-axle model. Single-axle trailers have one axle attached to one pair of wheels; dual-axle alternatives have two axles, each of which has a set of wheels. While both types of trailers have advantages, you may find that a dual-axle model is safer and more useful. Why? 1. More Stability