The old Postal Service creed of “Neither snow nor rain nor heat nor gloom of night stays these couriers from the swift completion of their appointed rounds” may be missing something—rural areas and “mobile” post offices.

“Covering the outskirts of towns, rural carriers represent the Postal Service day in and day out,” said Texarkana Postmaster Harold Bennett.

Called “post offices on wheels,” rural carriers can do most everything a stationary post office can do. They sell stamps and money orders and pick up or deliver registered, certified or insured mail, take cash-on...

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