550.32(A) seems to say a disconnect is required.
550.32 Service Equipment.
(A) Mobile Home Service Equipment. The mobile home
service equipment shall be located adjacent to the mobile
home and not mounted in or on the mobile home. The
service equipment shall be located in sight from and not
more than 9.0 m (30 ft) from the exterior wall of the mobile
home it serves. The service equipment shall be permitted to
be located elsewhere on the premises, provided that a disconnecting
means suitable for use as service equipment is
located within sight from and not more than 9.0 m (30 ft)
from the exterior wall of the mobile home it serves and is
rated not less than that required for service equipment per
550.32(C). Grounding at the disconnecting means shall be
in accordance with 250.32.