Abstract: The cost of preserving and transporting food is minimized, to the end that food may be made more widely available. A trailer, movable by a small vehicle, houses a completely self-contained food dehydration plant which can be towed to the field in order to preserve the food as soon as it is harvested. The plant dehydrates by blowing a stream of hot air over the food. In order to conserve energy, the air is preheated both in a solar collector (by sunlight) and in a heat exchanger (by exhaust air). Some air used for dehydration is not exhausted but instead is recirculated through the plant, further contributing to efficiency.