I used these wagon wheels on a kayak trailer I built. The kayak only weighs about 40 pounds so I'm not weighing them down in any way with a weight rating of 250 each. The solid tires eliminate my concerns about a "flat tire," and at 20 inches, they tip over easily. most bumps and potholes I've encountered. The 3/4" bearings (pre-installed) match perfectly with the 1/2" EMT conduit I used for the axle. They also come with 5/8" bearings if you need a smaller size. These wheels with bearings have very low rolling resistance and make it easy to move anything they're mounted on. I've worked with trolleys that have these these wheels have been replaced. These are much more versatile. If you need a wheel of this magnitude, consider it in your planning.