For the visitors, scrum-half Greg Robins scored twice and flanker Pete Mortimore three times.
Steve Chapple scored a try and added three conversions.
In the second half, Argaum also used the conditions well, made changes to the front row and held the visitors to two breakaway tries, the first from Angus Cann and the second from Matt Hallett.
The Ramblers stay on course to gain promotion from Devon Two without losing a game.