Michael says:
===============
Depending on the roof curvature, you might need a 2x6, but - don't
put the wood on the existing rack. Cut one side of the 2x6 to
match the curvature of the roof, cover with a layer of thin carpet
or strong, closed-cell foam and then rest it on the roof directly.
U-bolt it to the rack crossbar. Make one for each of the front
and rear crossbars.
================

WOW! Fantastic ideas.

THNX
Wilf