Heavy duty and well made. The wheel bolts stick up a little higher than I like, but have not caused any issues. My '79 Corvette sits on this and I can easily push it around the shop. The steel is thick and I have not noticed any sagging.

Good quality item, but even after greasing all of the casters it was quite difficult to move a small car in my garage. Perhaps I had set my expectations too high, but expect to exert some serious muscle to move a car loaded on these.

the item seems a bit flimsy and there was a problem because tires were missing so we had to get replacement that took a while. the company was less than friendly for this matter. the tire skates work ok but do need to be a bit more substantial. Not thrilled with this item but meh......

Overall these wheel skates are quite beefy and will handle a decent sized vehicle, but you get what you pay for. I am using them on a '69 Charger and they work adequately. I can push it around just fine by myself on epoxy coated concrete. I have wide tires on the rear (275s) and they do fit, but the bolt end does press into the tread. Due to this, and due to my concern for the overall quality, I am not storing the vehicle on these skates, especially since there are no locking castors. I may cut off the excess thread above the nut as it is just not necessary and see if the plastic wheels deform over time.

I lubricated the swivel bearings prior to assembly with good quality grease as others have indicated. The wheel bearings are non-serviceable, pressed together bearing and races, so they cannot be lubricated. It does not sound as if there is grease inside the wheel bearings as you can hear the ball bearings rattling around. Ultimately, the wheel assemblies are robust but on the cheaper side. Good assemblies have zerks on both the swivel and wheel bearing; these do not. I have lots of high quality castors at my shop, and will swap them out when these fail.

The major issues are the lack of zerks, the loose tolerances and the mounting nut underneath. This mounting nut is pressed in place. During this process, a little too much force was used, and they are very slightly deformed. The nut on top is 19 mm, as is the pressed nut on the bottom, but it is deformed just enough that a 19 mm wrench will not fit. I had to use a 20 mm wrench which is a non-standard sized wrench, and it's a little loose. If you don't have a 20 mm (the vast majority of wrench sets do not come with this size), you will have to improvise, perhaps with a 21 mm although that would be pretty loose, or maybe a SAE 25/32 (non-standard) or a 13/16. I doubt that an adjustable would get in there, so expect this issue and good luck. All you need to do is get something to bite so you can tighten the main nut on top. The nut on all 16 castors were deformed enough that a 19 mm wrench would not quite fit.

Put a 58 1/2 ton on them. Can move it around the garage by myself. My problem is getting the wheels on them going the right way I am trying to move the truck. If there is some debri on the floor can make it difficult. Also the truck has fell off the skates when trying to move if the wheels get stuck. Just pay attention to where the tire is sitting on the skate when moving especially if having trouble getting it started. Overall does what I need it to do.