It really depends on how your state law is worded. From our wiki page for Vermont:
Mirror Laws by State (U.S.) - EcoModder
Quote:
§ 1305. Mirror required
All motor trucks and motor vehicles towing a trailer or semi-trailer shall be equipped with a mirror not less than five inches in diameter or with less than 25 square inches of reflective area so attached that the driver shall at all times have a reflected view of other vehicles approaching from the rear. The mirror shall be attached in a manner that complies with the width requirements of section 1431 of this title. The extended rear-view mirror shall be retracted or removed when not towing a trailer or semi-trailer. (Amended 2001, No. 18, § 1, eff. May 8, 2001.)
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Wisconsin just says:
Quote:
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No person shall operate any motor vehicle upon a highway unless such vehicle is equipped with a mirror so located as to reflect to the operator a view of the roadway for a distance of 200 feet to the rear of such vehicle.
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So, technically I'd say I don't need any external mirrors because I can use the internal rear view.