4.7m (15ft) Boat Trailer: Introduction


This 4.7m boat trailer is a strong but lightweight trailer suitable for most boats between 13ft (3.95 metres) to 15ft (4.7 metres) long with a vee hull. With fully adjustable rear quad wobble rollers, an intermediate set of adjustable dual wobble rollers and keel rollers, this trailer will suit most alloy and fibreglass hulled boats. Launching and retrieving of your boat at the ramp, just got a whole lot easier and quicker!

Distance between the guards is 1850mm and overall length from the coupling to the rear quad rollers is just over 5 metres. 


The boat trailer plans include details of the winch post shown in the pictures above, and also two fully adjustable winch posts to adapt to different bow and winch eyelet setups.

The trailer is suitable for boats up to 600kgs although if the tyre and spring specifications are uprated, boats up to a maximum of 800kgs can be towed.

Disc Brakes can be fitted if required but wider guards will need to be fitted to compensate for the additional room the braking hardware will take up.Boata.png

Details are included for fabricating your own wobble roller arms and supports that will potentially save you hundreds of dollars. "Off the shelf" roller setups can be fitted in place if you are reluctant to build your own.

The trailer plans include details for preparing the trailer for galvanising (a must for salt water boating).


Allow for at least 300mm from the front tip of the boat to your tow vehicle to prevent the boat hitting when taking sharp turns. Additional clearance is required if you have an external rear mounted spare wheel on your tow vehicle or if the boat has a snub bow such as a RIB (rigid-hulled inflatable boat) or an over-length bowsprit.

The rear transom edge should sit as close to the rear most quad roller as possible, although a slight overhang (50-100mm) in most circumstances should be OK.

The trailer axle position is fixed and will suit most boat/outboard arrangements. If your trailer has an oversized outboard or has excessive rearward weight (fuel tanks, fish bins, batteries or other), consider moving the axle position backwards to compensate. If you are converting from an existing trailer, check axle position and match the position to the new trailer as long as there is sufficient drawbar weight to prevent trailer sway and to ensure stable towing. If unsure, tack weld spring hangers to chassis, fit roller hardware and temporarily fit the boat to the trailer. Check the drawbar weight at the coupling end, if weight range is between 60 to 80kgs, remove boat and fully weld trailer. Too heavy, move the axle/springs forward slightly, and too light, move backwards. 

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Happy building and boating!