The Atalanta and the Titania can be legally towed behind many 4×4 cars. The boat weighs between 2 and 2.5 tons (depending on equipment and fittings). A suitable trailer could weigh up to ¾ ton. So it means towing 2.5 to 3.5 tons. Check the maximum towing weight that the vehicle you want to use can handle. Some owners use landrover products. The Defender, Series 3, Rangerover and Discovery are all rated to tow 3.5 tons (the maximum legal limit). Other owners use double cab pick up trucks. The only pick ups which can currently tow 3.5 tons are the Isuzu D Max, and the Ford Ranger. Most other makes have lower limits.
The Atalanta will sit comfortably on a 4 wheel trailer, which of course has to be capable of carrying the 2 to 2.5 ton boat. The only unusual feature is that the hull has to be supported on specially made padded wooden crossbeams, The boat will be damaged sitting on the standard rollers and supports that a trailer might come with. Atalantas are light and the support has to be in the correct places to avoid damage. The association can provide drawings for the support beams.
A word of caution. Atalantas have always been susceptible to snaking. It is a long boat carried on wheels set close to the middle. If it does snake it is usually caused by the boat being too far back on the trailer. This results in the nose weight being too light. Snaking has been known to result in boat and towcar ending up on their sides. A couple of owners (I’m one) have 6 wheel trailers which seem to be more stable on the road. Having made the warning, remember that these boats have safely traveled many thousands of miles on trailers over the last 60 years. I have trailed my own boat about 12000 miles in total.