Driver side wiper Goes too far to the left.

There are a number of Forest River coaches experiencing this problem. What seems to have happened is the factory failed to insert the serrated locking washer under the acorn nut that holds the wiper arm on the splined drive spindle. Remove the acorn nut, pull the wiper arm off the spindle and reinstall it to the correct location, then reinstall the acorn nut but use a bit of blue LocTite to keep it from coming loose. Should solve the problem. Make sure to do both sides.