Garaging as an accessory use for not more than three motor vehicles may be erected on a single lot in any Residential Zone District. Not more than one boat, house trailer, other trailer, or truck with a maximum weight carrying capacity of one and one-half (1 1/2) ton pickup or panel delivery owned or used by a resident on the lot, may be garaged on the lot, provided, however, that the boat, house trailer, other trailer, or truck shall be kept in an enclosed garage when on the lot.