In Portland, Ore., the food-truck scene tends to die down during the winter months, but some truck owners are looking for ways to winterize and make their food appealing whatever the weather. Large plastic tents keep the rain off hungry customers, while propane heaters and gas-powered fire pits help keep everyone warm. "The heat won't be enough to replicate a restaurant experience, but it will make it pleasant to eat," says one truck manager.

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