We always run the fan continuously when the A/C is operating. I do not think there would be any additional wear on the components, and there may even be less as the fan is not starting and stopping continuously. Also, as John indicated it will help to keep the evaporator dry which will eliminate the problems with excessive moisture, mildew etc. The other benefit is that it will keep the temperatures in the coach more consistent as it is constantly circulating the air. An added bonus is that many coaches use the area behind the refrigerator as a large plenum for the evaporator to receive its' return air. This air will be heated by the refrigerator, and may take longer to cool off if it has not been circulated. Same thing in the front overhead, and rear cap if the coach is sitting in the hot sun. I even operate our dash A/C in the bus, and our passenger cars for a few minutes without the compressor going to dry off the evaporator prior to shutting down.
Steve & Rhonda Bennett
Dana Point, CA
92 Marathon XL40
2012 Jeep Rubicon Unlimited
Owner: California Coach Company, LLC