(b)
Under regulations prescribed under section
5738 of this title, an employee who transports a house trailer or mobile dwelling inside the continental United States, inside Alaska, or between the continental United States and Alaska, for use as a residence, and who otherwise would be entitled to transportation of household goods and personal effects under subsection (a) of this section, is entitled, instead of that transportation, to—
(1)
a reasonable allowance for transportation of the house trailer or mobile dwelling, if the trailer or dwelling is transported by the employee; or
(2)
commercial transportation of the house trailer or mobile dwelling, at Government expense, or reimbursement to the employee therefor, including the payment of necessary tolls, charges, and permit fees, if the trailer or dwelling is not transported by the employee.
However, payment under this subsection may not exceed the maximum payment to which the employee otherwise would be entitled under subsection (a) of this section for transportation and temporary storage of his household goods and personal effects in connection with this transfer.