Here are some pics of the tow hitch for the Summit which someone made up. The trailer frame is made of 12mm Alloy box tube. The axles are 25mm box tube. The suspension is 20mm x 25mm angle. The draw bar is 12mm x 12mm angle.The tow ball & neck is a Baja 5B steering rod end. The rims & tyres are Blast wheels with Phaltline tyres. The trailer hubs are off a 1/8 buggy