There are several brands and models of water pump but I've not run across any with adjustable pressure. Sounds like you need a new pump, hardly surprising with a 34 year old trailer. They aren't expensive and it's a fairly easy job unless it's in a difficult location.
Walt
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Past owner of 1995 13' Casita, 1994 16' Casita, 2012 Parkliner, 2002 17' Bigfoot.
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