I have used both the ones in front of the steers and the ones to the rear. Lately because I have gotten into the habit I have been using the front ones and see no indication of any stress on the frame or shell. I have opened and closed doors, bays and windows and everything opens and closes just the same as when it is sitting on the wheels.

My information on supporting the coach showed the front support only, but if the rear support on the front frame is used it will actually reduce the weight supported at the rear which may be a good thing.