Bilenky - does a retro fit coupler on steel bikes- not all 520's were created equal -
what year - if you are doing couplers for travel with a touring it's good as any. It's not light - but it's built to handle a load. by the way I have a Waterford Adventure cycle - non coupled - around $2000 frame alone - I just take it apart ship it when I travel - sometimes ship it ahead via rail, or bus, - I have a travel case. Big jump from a 520 to a coupled bike and or a Waterford, what are myou trying to accomplish.