Bike trailer hitch using a wheel caster, 1/4 u-bolts, and

Tow Dolly with Surge Brakes – Tow Smart Trailers

No Wobble Bolt

Is it weird to use a bike trailer to carry kids in for groceries instead? - Quora

Building a Strong Flexible Bicycle Trailer Coupler. : 4 Steps - Instructables

This hitch has the larger 15mm/.6 inch hole to accommodate the large bolt that some electric bikes use with their axle. Buy this additional bike hitch if you plan on using an electric bike. Check the bolt/axle's diameter before purchasing.

15mm Rounded Angled Bike Hitch for Electric Bikes

Building a Strong Flexible Bicycle Trailer Coupler. : 4 Steps - Instructables

Complete assembly with bearings, seal, dust cap, cotter pin and lug nuts Fits both 1 and 1-1/16 diameter straight spindles Hub measures 4-1/4 inches

Rigid Hitch Incorporated Trailer Hub Kit (BT-150-F) 5 Bolt on 4-1/2 Inch Circle - Fits 1 and 1-1/16 Spindle

Bike Box Alan- Technical Information

Hillman 46316 Gun Screw, #6-48 Thread, 1/4 in L, Oval Head, Hex Drive

Bike Trailer Hitch : 3 Steps - Instructables

Try the Ultimate Trailer Jack Trailer Jack on your boat trailer, four-wheeler trailer, jet ski trailer, lawn mower trailer, farm equipment, camper trailer, utility trailer and cargo trailer. The trailer jack retracts flush with bottom of trailer eliminating potential damage to the jack and the trailer as a result of hang-ups or snags while crossing uneven terrain. A mounting bracket may be welded or bolted onto the trailer jack.