quick-fix: get some thule or yakima bars/clamps and return them after the trip?
long term fix: my rola roof rack would slide to a side when clamped to factory roof bars and loaded down heavily, and just didn't seem secure in general - so we converted it to a semi-perm mount:
hard-mounting addition:
http://www.offroadpassport.com/forum/showpost.php?p=1606&postcount=99
carriers:
http://www.offroadpassport.com/forum/showpost.php?p=2303&postcount=111
final shots:
http://www.offroadpassport.com/forum/showpost.php?p=2399&postcount=114
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