Thanks for the advice once again Kenny
That Surly hitch looks great but I cant for the life of me figure out why the left hand axle mounted hitch is better than a hitch at the back of the bike in the middle like nearly every other vehicle trailer hitch has, the only benefit i can see is ease of attachment to any bike frame as they all have a rear axle to attach to but the surly mount had the bracket that goes all the way around the wheel anyway so wouldnt mounting the hitch in the middle be better?
The bikes handling hasnt been affected noticably with my current design, its the trailers handling that im worried about, will the longer hitch arm help prevent sway at higher speeds?
I know about loading from towing car trailers for quite a few years but thanks anyway