These rear load wheels are sold as a pair and were designed to bolt directly onto a rear wheel center hub. These give better cabinet clearance when loading and unloading the race car as well as added bunk space in the nose of the trailer. This design was rendered off of a Weld Racing hub and should universally fit sprint and midget hubs. They are strong enough to carry the full load of a COMPLETE car with engine rolling in and out of the trailer. We have used these for 3 years now, loading in and out at the track, and traveling up and down the road. I mount them to bent hubs I no longer race with.
