Subaru 2005 Legacy Owner's Manual page 439

Driving tips
Rear crossbar:
A) Zero gap
Install the rear cross bar so that the rear edges of both
crossbar end supports are aligned (zero gap) with the
front edges of both rear roof rail supports.
Install the rear crossbar in the same manner as the
front crossbar.
Do not carry cargo on the roof when the cross-
bars are removed. Luggage on the roof will be
thrown forward or backward in sudden stops or
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rapid accelerations, resulting in a dangerous
road hazard.
NOTE
Before each use of the roof crossbar, make sure
the four T-30 crossbar clamp screws have been
checked, and retightened if necessary to 35 lbf·in
(4.0 N·m, 0.41 kgf·m), as outlined in Step #5 above.