Owners maintain the engine and forget the trailer, and the trailer is what strands them.
The boat gets the attention because it is the expensive half of the investment. The trailer gets backed into the driveway and forgotten between trips, and it is the half that actually fails on the way to the lake.
A car's bearings run hot and stay dry. A boat trailer's bearings run hot from the highway, then get dunked into cold lake water at the ramp while still hot, then sit for weeks between trips. That thermal shock and repeated wet-dry cycle stresses seals and grease in a way ordinary trailer use never sees, and it is the classic reason a bearing seizes or a hub separates on the road.
Trailer brakes sit unused for long stretches, get dunked at the ramp, and then get asked to work reliably on the next trip. Corrosion and lack of use are harder on them than regular use would be, which is the opposite of what most owners assume.
Trailer wiring and connectors spend their working life getting submerged and then drying out, which is exactly the condition that causes corrosion inside a connector long before the wire itself fails. A light that flickers or drops out is usually telling you about a connection, not the bulb.
Trailer tires cover far fewer miles than a car's tires but sit loaded and exposed to sun for most of the year, and rubber degrades with age and UV regardless of tread depth. A trailer tire that looks fine can be old enough to be a real risk, especially towed at highway speed.
Bearings for play or heat after a short drive, brakes for response, lights for function, tires for age and pressure — none of it takes long, and all of it is cheaper before the trip than a roadside call during it.
A boat that will not start is an inconvenience at the dock. A trailer failure happens at highway speed with a loaded boat behind it, which is a meaningfully different kind of problem to have.
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