Fisherman's Friend

In the village La Antilla there's a fascinating fisherman community. They keep their boats on the shore, away from the water, where the high tide can't reach them. When they go fishing, they pull the boat with a tractor to the ocean, where they start the boat engine and go. Usually 2 to 3 people per boat. They use large nets to fish.

When they come back from fishing, a tractor is ready and waiting for them in order to pull the boat away to a safe distance from the ocean.

These tractors are indestructible. They keep them just there on the beach, fully exposed to the elements of nature, sun rain, salty water, wind, sand and storm. They look decades old and always function. How tough a machine has to be, in order to withstand that?