Hacked, Conversions and Trailering"Harley Sidecar, Conversion Trikes and Motorcycle Pull Behind Trailering Enthusiasts"
A forum for the discussion of your sidecar, Conversion Trike or Pull Behind Motorcycle Trailer.
The Softail and Dyna have different frames. Never tried a swap myself, but I I know it will require major modifications if it will fit at all. I'd keep looking for a dyna tank.