Ed, it sounds from your description that the wiper controls may not have an adjustable intermittent function. Is that the case?
Also, if switch is too far to reach comfortably, does it look like there may be a better place to have it relocated to? That may not be possible on existing motorhomes because it may leave a hole in dash, but may be an option on future motorhomes. Factory stalk would be best but I'm guessing there is a reason Thor didn't go that route.
By the way, your 10.24 MPG for entire trip is excellent. Do you mind sharing how fast you typically drive and whether you towed a car?
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