Towing weight: the overall weight of the boat, trailer and equipment averages about 1.5 tonnes (1500kg)
Inboard or outboard?
The inboard engine is better for running lots of electrics and is possibly more reliable but maintenance is more difficult and likely to require visiting a boatyard. Inboard and outboard versions have the same displacement and there is no real difference in either sailing or motoring perfromance.
The outboard engine is easier to maintain (or take ashore to be fixed). The Mk I outboard version has a much bigger cockpit and a large void under the duckboards where you can stow a small inflatable. You can fit an outboard with power output to run electrics if required or fit a solar panel to recharge the battery.
What is the difference between a MkI and a MkII?
Not a great deal. The MkIIs, introduced in 1995, have a slightly higher cabin roof (good for those over 6ft tall), a cabin escape hatch for'ard and a smaller, but self draining, cockpit. There is no void under the duckboards to stow an inflatable.
Breakback or Combi trailer?
The breakback trailer (which hinges in the middle) can be easier for launching (depending on the steepness of the slipway) and is lighter overall. The combi, which has a launching trolley which sits on the road trailer, enables you to launch the boat without immersing the road trailer in salt water. The combi trailer has a higher centre of gravity when towing.