We have in fact tried several of these approaches Our Airstream is 140' vertical from a creek. As of now we use a ram pump to bring water up hill. At one point we put our reservior uphill from the camper to gravity feed the camper, but there was little water pressure for showers and washing dishes. we then bought a transfer pump which gives us plenty of water but we must manually turn it off and on!!!
in the future we are hoping to build a house, fully knowing that our nearby neighbors have spent $20,000 for their wells. we are seriously looking into other options