I have had several members contacting me on my hauler. For those interested, here are the pics. My Hauler frame is made of shed 80 stainless pipe...Shed 40 would also do fine. For attaching the hauler head to the shaft...Just purchase from stihl a small (approx 50mm) bush , this has the female patten to fit the shaft.

any more questions ...feel free to ask

Cheers Michael