Carry-On Trailer 2 in. Axle Dust Caps, 2,990 lb. at Tractor Supply Co.
Mobile Home/Trailer Axle Dust Cap (2 Pack) - H & S Mobile Home Supplies
Amazon.com: XIKE 2 Set 1.98" OD Trailer Bearings Dust Cap Grease Cap with Rubber Plugs, Fits Trailer Wheel Hub 2,000 lb to 3,500 lb Axles - Blue. : Automotive