The Ursa Contractors wagon is ready when you are. Designed for big jobs and big loads...400 lb capacity. We see these used mostly at construction sites and home center nurseries. You can choose pneumatic or "never flat" tires. If you work around nail s screws or construction debris then get the never flat tires. These airless tires are made of lightweight micro-cellular polyurethane on a heavy duty steel rim with ball-bearings and grease zerks. When combined with Ursa`s incredible maneuvering and easy dumping the Ursa Contractors wagon means easy wheeling through whatever gets thrown your way