If your plumbing is enclosed within the RV (i.e. it's a reasonably cold-weather capable model), you will have no problems. The interior will not get below freezing in these conditions unless you do something really crazy like leaving all the windows wide open.
If you have pipes hanging down unprotected, there's perhaps a slight chance of problems. I personally would not worry about it too much. It does make sense in any case to not invite problems by, for example, leaving it hooked up to (unlimited) city water with the tap open; but with the tank drained and the pump off and not much water available, any potential damage is pretty limited to just the plumbing fittings themselves, and a bit of care in setting up next time should allow them to be verified fairly well.