If any motor vehicle on which taxes have been paid in advance by a special LP-gas permit user for which a permit decal has been issued shall, prior to the end of the calendar year, be destroyed, sold, traded or otherwise disposed of, or for any reason the permittee ceases to be the owner or operator thereof, the permittee shall be required to remove such decal and immediately give notice in writing to the director of such destruction, sale or other disposition thereof. Failure to remove such permit decals and to notify the director in writing of such removals as above provided shall be grounds for cancellation of the special LP-gas user permit or for requiring such person to secure a user’s license, except that when a motor vehicle upon which the tax has been paid in advance is sold or transferred by one special LP-gas permit user to another special LP-gas permit user or to a person who shall qualify for and obtain a special LP-gas user permit, the director may issue written authority to transfer the decal issued and attached to said motor vehicle and all rights and obligations thereunder to the purchasing special LP-gas permit user in such manner and form as may be required by the director.