Wheel mounted easily on 4" x 6" runners. I used what appeared to be 5/16" screws to install the panel(s). Mounting screws are not supplied with the product. The wooden porch, which weighed about 900 pounds, was offset about 200 feet. Two wheels were attached Bolted to the underside of a 4" x 6" sled that supported the porch and offset slightly forward of the center of the sled. A tractor was attached to the porch with forks for pushing. The wheels worked fine. There is no air in the wheels, saving the user from having to check tire pressures. The wheels simply never sag and can withstand up to a nominal 500 pounds - and probably more. The surface was rammed with limestone. The wheels moved along perfectly the limestone pack. The wheels would have problems if the surface was loose gravel 3" thick or thicker. After moving the porch, I removed the wheels for later use in the Building a mobile desktop. The smell of rubber tires was not a problem. I used the product outside. There is a slight smell of vulcanized rubber that eventually goes away. These wheels are designed right, hold right, mount right, and roll right. I was impressed. High quality at an affordable price.
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