Rock Sponsor (Level 1)
Your yellow arrow points to our cross member.Michael, question...
In the below picture, which features only the sliding portion of LOD's rack system (as taken from an installation manual page on their website) which do you consider the "crossmember" here: the tubes pointed to by the red arrow or the yellow arrow?
From context I'd guess you mean the tubes pointed to by the red arrow. To my mind's eye, cross members are typified by the tubes pointed to by the yellow arrow---but, the important thing, regardless of meaning, is to understand where you envision connection points to be.
As a matter of context, the tubes pointed to by the red arrow travel the length of the vehicle while the yellow ones cross it: from passenger's to driver's side (or vice versa.)