Hi all, new to the forum but not to the boat transport industry.
Well all I can say is if you can tow it good luck!! If you are lucky enough to have the entitlement on your licence thats a start. Any vehicle towing is limited to a trailer weight of 3500 kgs, and that is gross. That means you take the weight of your trailer off your 3500 kgs, giving you the weight you can load. The only way you can tow more is if you have your Hgv. There are only a few tow vehicles that can legally pull 3.5t (I.e range rover, discovery, land cruiser) most 4x4's can't. (l200's, pajero/shogun etc etc) so carefully check your vehicle specs.
You may see pictures of certain vehicles towing what is blatantly overweight loads, but it is only a matter of time before there is an accident or vosa catch up.....if there is an accident and you are unfortunate enough to be the owner of the boat, don't think that any insurance policy in the world is going to pay out once they know the circumstances. And if vosa stop it, the boat will not be moving anywhere until it's on a suitable vehicle. Sorting this out alone could be costly- especially if you have already paid a 'professional' to do it.
So, if in any doubt, use a reputable, professional company who will move the boat with equipment suitable for the job.
It may cost a little more that way but you won't loose everything if it goes wrong.