The Open Range series of TTs and fifth wheels have a port for filling with glycol for winterizing or fresh water tank filling. The water faucets in National Parks usually do not threading for hoses. We carry five 6 gallon plastic jerrycans (from Walmart) so that we can fill up elsewhere when we are dispersed camping aka boondocking. Have a hose fitting on the port and the pump pulls water in about 2.5 gallons per minute. This has worked quite well for three years. Most other rigs probably have the same capability.
Reed and Elaine
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