Hello all, my name is lyle and I have a 1000w fat ebike rear axel drive. I just purchased the trailer I wanted but I knew it would not fit because my bike has a million attachments using up all my anchor points. So I am going to weld a seat post hitch and bar. This is why I am here. Well to be part of the community but truthfully I am in need of a bit of help locating the namw or the part that is basically a universal joint coupler. Although most ujoints have bearings and are way too beafy for a 1 or 2 inch bicycle towbar. I am not sure what it is called or where to buy it but I need to be able to weld both ends and have it articulate on the vertical plain as well as left and right on the horizontal plain relative to the bike. A 3rd axis would caus the trailer to cant left or right from perpendicular to the bike. I see many trailers this style online in pictures but I cant find it or its name. Anyone? Help. Here are pics of my bike and trailer. Other close up is the type of joint I need for my tow bar. Thanks.