The average J27 weighs in at around 1750 kg (3860 lbs) including the rig and outboard. Legislation for most countries state that a trailer should have a Tare weight (empty trailer mass) and GVM (Gross Vehicle Mass) stated on a plate attached to the trailer. Mine is 705 kg (1554 lbs) (Tare) and 2400 kg (5291 lbs) GVM. Subtracting the Tare from the GVM will give the maximum safe weight the trailer is designed to carry. In this case, it is right on maximum. The J27 will require a double axle trailer with either air, or over-riding brakes.

Legislation generally states that the towed trailer fully loaded may not exceed two thirds the mass of the towing vehicle. But check your state/country for correct laws. Most commercial LDV's will tow this rig quite comfortably, but I would say 2500cc worth of engine power is a minimum requirement and sedan vehicles are generally not good for towing over any sort of distance other than a very short hop as their suspensions are too soft.

On longer trips try these tips:
Never exceed 80 kph
Stop every 200 km and check that everything is OK
Tyre inflation for the rear trailer axle is 3 bar and the front axle 3.5 bar
Watch out for anything controlled by a butterfly nut - they have a tendency to "unwind" from vibration
If your trailer has adjustable support pads for the hull, seal them in position for the trip (cable ties work well) as these pads also have a tendency to unwind on a long trip. Your boat could end up resting on its keel.
Also find a way to secure the jockey wheel lock nut from freeing itself - again a cable tie does the trick.
Check the tow vehicle and trailer tyre pressures every hour - in hot weather the tyre pressures will increase substantially. Carry a pressure guage with you and deflate back to the recommended pressures above.
Never use ordinary car tyres on a trailer of this size. Fit proper 4 ply commercial tyres.
Be aware that the CG is quite high so adjust your speed on bad roads and especially around corners.

  • Smackwater Jack