Pulling force when slipping, ramp, the loaded trailer and trailer damage
The force pulling everything back down the ramp is the weight of trailer and boat times the
gradient in per cent; from fifteen per cent upwards you need four-wheel drive to avoid damage.
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With a trailer and boat weighing one and a half tonnes, a ramp with a gradient of twelve per cent calls for around a hundred and eighty kilograms of pulling force, and on wet, algae-covered concrete that is more than a front-wheel-drive car can manage. On top of that, the driven wheels end up in the water once the trailer is far enough in.
The most common things that go wrong when slipping: wheels spinning, the loaded trailer sliding back down the ramp, a boat that comes off the rollers too early. All three can be avoided with wheel chocks and a second person.
Check that your standard hull cover applies when slipping and craning. Check too whether the trailer is included in the liability cover, including when it is uncoupled, which is exactly what matters on the ramp.
Frequently asked questions
When do I need four-wheel drive?
From a ramp gradient of roughly fifteen per cent, and at a lower gradient if the surface is wet.
Am I insured when slipping?
Usually standard hull cover applies; whether the trailer is covered depends on the policy.
Worked out for your type of boat
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