Are Fin Keel boats that difficult to transport by road?

[bignick]

Many Hunter Medinas were supplied with “piggyback trailers”, which used a bogey/wheeled cradle sitting on a main road trailer. The design means you didn’t need to put your main trailer bearings and brake discs in the water when launching. The visual clue is that they have a couple of narrow channels for the cradle wheels to run in, to guide it into place. If you could find one it may help you but the channel spacing would need to be spot on. You’d still need to add some fore/aft triangulation to the cradle though.

 

[Bodach na mara]

The thing under the boat in the picture posted by the O.P. isn't a trailer, it's a cradle with wheels. I doubt whether it is included in the sale.

 

[William_H]

Perhaps not much help to OP but around here trailers for 20ft fin keel are relatively common. That because bilge keel style is never seen. The trailer consists of a long back bone hitch to aft of fin keel back. A channel section is provided for the fin to sit in. A cross member under the keel takes a wheel on each side and a post upright to provide lateral support for the boat. A post at the front near the tow hitch goes up to a support for the bow. (hint mnake this post movable so you can get it forward out of the way until boat is dry and level.
The whole is submerged to float the boat on. Usually on an extension draw bar or jockey wheel and rope. makes it all doable for taking boat home for winter and perhaps moving location but a bit tedious to operate as a trailer sailer. (not impossible with a decent ramp available)
Back to original question. I imagine provided wheels on cradle are not too far spaced you could winch it up planks onto a car carrier trailer. ol'will

 

[oldharry]

Any boat less than 8 ft wide can be towed behind an adequate tow car.
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Very few modern cars can legally tow much more than a ton. Car handbooks give a set of figures for max trailer weight, and 'maximum allowable mass', the all up weight of the vehicle, trailer and load. That means you can't heap the cr full of gear to reduce the load on the trailer if it still takes it over the limit.

If you H 20 weighs. a ton it will already be more than most cars can tow even before adding the weight of the cradle, trailer and gear.

Caravanners frequently fall foul of this rule, piling their vans with gear, and local plod round here have field day pulling them!

Rules are different for Landis's and other light commercials which generally have much higher limits. My van for example can legally tow much heavier weights.although it has a smaller less powerful engine than my car.