In an effort to find the best wheelbarrows for the job, I tested four from trusted brands, using each one to haul loads of mulch from my front yard to my backyard over varied terrain. While any empty wheelbarrow may be easy to move, the wheelbarrow’s weight contributes to the overall load you’ll need to lift and push when the wheelbarrow’s full. There’s also a positive correlation between tray size and the wheelbarrow’s maximum weight limit, or the amount it can safely carry without breaking. Number of WheelsWhile the classic wheelbarrow features a single wheel, there are also cart-style wheelbarrows that sit on two or four wheels. Wheelbarrows usually come with either air-filled pneumatic or hard plastic tires.