I suspect if you were building a 10m HP, buying a basic boat trailer and modifying it to take the length would not be a significant component of the build (getting it registered might be the challenging bit). The trailer does not need to be heavy duty to carry a 10m HP.  You probably would not even need trailer brakes.  All mid size SUVs have a legal unbraked towing capacity of 750kg in Australia.

Small to mid size sedans or hatches like a VW golf typically have legal unbraked capacity of 500 to 700kg.

The trailer at this link has a load carrying capacity of 440kg in its present form:

Basic price for something like this is AUD700.  It would need considerable lengthening of the front bar to get the CoG forward of the axle for a 10m boat and addition of back bars to cope with the overhang requirement.  But the boat weight would likely still be within the rated capacity.  Then it is a matter of getting it registered in its modified form.  

Given that there would be a lot of trailer to the last roller set behind the axle i doubt you would even get the wheels wet to launch.  Remember that the boat floats in nothing. With the rollers kissing the water it would not be difficult to walk the boat at least half on providing the rollers actually roll and there are ample guide rollers to prevent it sliding off sideways.  

Attached photo shows my 120kg 8m long trimaran on its trailer.  Once the boat is tied down it stiffens the trailer.  The trailer flexes to the boat.

This tralier started out as a pedal boat trailer for a 6.2m long pedal boat that weighed 22kg.  I rooftopped various pedal boats for years, the longest 7.2m,  but having a trailer is more convenient and I can carry ate least 3 boats.  When I was shopping for a trailer I talked to a specialist boat trailer builder who insisted I would need a tandem trailer for a boat longer than 20ft.   He had no comprehension of a 22kg boat.  You may find a suitable trailer that has been built for rowing shells as some of those are up to 10m in length.  The rowing 8s are often in two pieces.  

At one stage I had a 24ft MASRM trailer sailor.  The hull and gear weighed 700kg and the ballasted dagger board weighed 600kg so total in the boat of 1300kg.  It was on a 400kg trailer with a single axle; making almost two tonnes behind a 1500kg vehicle.  The boat came with the trailer and it had a single axle with Torflex suspension.  The tyres were for a light truck and were inflated to 50psi.  There was no issue with the single axle and truck rated tyres as far as load carrying was concerned BUT if I lost concentration and exceeded 95kph then it was a real challenge to get back below 90kph without starting a death yaw.  Without any hitch stabilisers it was a challenging tow.

A long trailer requires some thought as to the route as well as concentrating when driving to avoid cutting corners. It is not that difficult because trucks deal with these issues constantly.  I believe it is safer to be able to travel at posted speed if you are in any traffic rather than going slower than the surrounding traffic.  

This link gives guidelines for rowing shell trailers for NSW.  Similar rules are likely to apply in other jurisdictions:

A HP is not much different to a couple of rowing shells so a lightweight trailer for just a few boats rather than the whole school or club would be the type of trailer to look for.  A shell trailer for a school or club  is likely going to cost more than one of the boats it carries; expect north of $12,000.  A converted Easytrailer or something similar maybe $1200 with lengthening and decent rollers.

Rick

  

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