Boat Trailers

Bunks or rollers under the hull:

the difference that matters at the ramp is how the boat sits. A bunk trailer carries it on carpeted boards shaped to the hull, spreading the weight evenly, but it needs deeper water to float the boat on and off. A roller trailer lets the hull roll off in shallow water, which helps at a sandy launch such as the canal at Monterrico, though it presses the weight onto a few points and has more parts to seize. A single axle suits most small outboard boats and is easy to push by hand; a tandem axle carries a heavier boat more steadily and keeps rolling if one tyre goes flat. Imported trailers from makers such as EZ Loader or Continental arrive hot-dip galvanized, with adjustable bunks and a plate stating their capacity. Locally welded trailers are built around one particular hull, often in painted steel, and are only as good as the welder and the paint. Smaller frames are made for jet skis, sometimes two side by side, and for dinghies and inflatables light enough to launch by hand.

Matching a trailer to the boat it will carry:

start with the weight, not the length. Add up the hull, the outboard, a full tank and the gear that stays aboard, and the trailer’s capacity has to clear that total with room to spare. The bunks should also reach far enough back to support the transom, because an outboard hanging off an unsupported stern slowly bends a hook into the bottom of a boat stored on its trailer for months. A flat-bottomed aluminium skiff and a deep-V fibreglass hull want very different setups, so a trailer that carried another boat usually needs its bunks moved. Check that the coupler matches the ball on your vehicle and that the light plug fits its socket, and think about the road between the highlands and the coast: on the way down, a heavy boat on a trailer without brakes is pushing the car through every bend. If you are buying both at once, look at power boats with the trailer in mind.

Wheel bearings first, then springs and frame:

lift each wheel off the ground and spin it. A rumble, a grind or any rock at the top of the tyre means worn bearings. They fail more often than anything else on a boat trailer, usually from backing hubs still hot from a long descent straight into cold water, which draws water in past the seals. Underneath, look at the leaf springs for cracked or flattened leaves and rusted shackles, and at the crossmembers and welds for rust bleeding through. Painted steel and closed tubes rust from the inside, so a tube that sounds dull when tapped or has swollen seams is worse than it looks. Lift the carpet on a bunk to see whether the wood beneath has rotted. Tyres on a trailer that sits in the sun crack along the sidewalls long before the tread wears, so read the sidewall rather than the tread, and ask whether a spare comes with it. A frayed winch strap is cheap to replace but tells you how the trailer was kept. Ask for the papers that go with the trailer and check that the number on them matches the one on the frame.

A trailer that has outlived its boat:

the buyer’s question is whether it will take their hull, so give the length and type of boat it carried, the capacity from its plate or from the builder, the number of axles, bunks or rollers, and whether it is galvanized, painted or aluminium. Say when the bearings were last greased and whether the lights work, and photograph the hubs, springs, underside, coupler and the plate or serial number. Someone driving over from Quetzaltenango to collect it will want to know that it can be towed home empty the same day with a spare and working lights, and whether the bunks will adjust to the boat waiting for it.