How Many Fenders Do You Actually Need for a Trailer Boat? (Australian Guide)
If you’ve spent any time around boat ramps or marinas in Australia, you’ve probably noticed the same thing we have: a lot of boats are under-protected.
Too few fenders.
Fenders that are too small.
Or fenders tied so badly they might as well not be there at all.
And it usually ends the same way — scuffed gelcoat, dented tinnies, or that horrible crunch when a boat leans into a pontoon.
So let’s clear it up properly.
How many fenders does a trailer boat really need?
For most Australian trailer boats between 4–6 metres, the realistic answer is:
Three to four fenders on the side facing the dock.
Not one.
Not two dangling at random heights.
Three or four, positioned correctly.
Here’s why.
When your boat is tied up, it doesn’t sit perfectly still. It moves with wind, wash, and tide. One or two fenders only protect a small section of hull. The rest is exposed.
Three or four fenders spread along the hull give you continuous protection, especially in marinas with floating pontoons or exposed jetties.
Fender size matters more than people think
We see a lot of trailer boats running undersized fenders. They look fine until there’s pressure on them.
Small, thin fenders compress quickly. Once they flatten out, they stop protecting the hull.
For most 4–6m trailer boats, you want fenders that:
- Have enough diameter to keep the hull off the dock
- Don’t fully compress under load
- Sit at the correct height when tied up
If your fender flattens easily when you squeeze it by hand, it’s probably not doing much once your boat leans into it.
Common mistakes trailer boat owners make
These are the ones we see most often:
Using only one or two fenders
Running fenders that are too small for the boat
Tying them too high or too low
Using thin rope that lets fenders slide out of position
Any one of these can lead to damage. Combine a few and it’s almost guaranteed.
What we’ve seen working best in Australian marinas
After spending years around trailer boats, tenders, and larger vessels, the setups that work best are always simple and consistent.
A complete fender kit, matched to typical trailer boat sizes, removes the guesswork.
That’s why we put together our Fender Kit — not because people asked for another product, but because we kept seeing the same damage caused by poor setups.
A proper kit means:
- Enough fenders to protect the hull properly
- Correct sizing for common Australian trailer boats
- Lines that hold fenders where they should be
No mixing and matching. No last-minute ramp improvising.
Final thoughts
Fenders aren’t exciting gear. No one shows them off on Instagram.
But they’re one of the cheapest ways to prevent expensive damage.
If you’re heading out for the first few trips of the season, take a look at your setup before you leave the ramp. A few small changes can save you a lot of frustration later.
And if you’re not sure what size or how many you need, it’s always better to run one extra than one too few.
