The 260 is a water ballast and it cannot accommodate an onboard diesel. If you are talking about an onboard diesel, it is a 270 wing keel. I introduced both boats in 1997
Both boats were designed as trailerable boats.
Added weight to the mast would make much more difficult to raise, less stable and whatever is on the back of the mast will be crushed when it comes down on the aft mast carrier. In addition the mainsail was designed as a bigger sail than the standard mainsail for more power. It came standard with one reef. I would suggest a second reef for high wind if you want to do that but one would need to experienced