Notwithstanding § 621.206, a trailer may carry a load that extends more than four feet beyond the rear of the trailer if the load consists of a motor vehicle that:
(1) is designed and intended to be carried at the rear of the trailer;
(2) is used or intended to be used to load or unload a commodity on or off the trailer;
(3) does not extend more than seven feet beyond the rear of the trailer; and
(4) complies with each applicable federal motor carrier safety regulation.