That sounds similar to a camper we had years ago. The water system was pressurized and had an air pump, rather than the demand type pump systems used more recently. We filled the water tank to about 3/4 full, then used an air supply regulated to 45psi to pressurize the tank through the Schrader valve in the cap. When a faucet opened, the pressurized system delivered water. When the pressure dropped to about 30psi, the air pump came on and built up pressure again. The reason we only filled to 3/4 full is to give the pressurized air room to expand. Great looking trailer, happy camping!
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