We are making and exporting heavy-duty square jack & jockey wheels in China. Capacity 7000lbs, 10k lbs, 12k lbs, 500lbs, 1000lbs, 2000lbs, etc. Net weight: 16kgs, 32kgs, etc. Max. Height: 1540mm, 1240mm, etc. Style: Plate, etc. Which are available. If you are interested in trailer jockey wheels/ square jack, Pls contact us.