The Vevor adjustable trailer dolly is designed to move lightweight trailers, boats, RVs, and small utility trailers with control and convenience. Its carbon steel construction supports up to 300 lbs tongue weight, while the adjustable hitch heights and dual ball sizes improve compatibility with different trailers. An 8.5" pneumatic rubber tire helps provide stable movement across concrete, grass, uneven ground, and sand. The folding single-wheel design also makes storage easier when the dolly is not in use.