A header (14) for an agricultural vehicle (10) including a frame (16), at least one axle assembly (24L, 24R) positionable in between a transport position and a field-working position, and a pair of wheels (26) connected to the at least one axle assembly (24L, 24R). The at least one axle assembly (24L, 24R) includes a telescoping mount (28), an axle support member (30) rotatably connected to the telescoping mount (28), and an axle (32) slideably connected to the axle support member (30) such that the axle (32) rotates and slides relative to the frame (16). The wheels (26) are configured for at least partially supporting the header (14) in the transport position and the field-working position
