Final touches:
I added the eye-bolts to the center crossbar spaced at exactly 9 5/8" from one another (starting at the edges of the crossbar mount). Be careful when tightening the eyebolts. Tighten just enough to collapse the lock washer. Beyond that will start collapsing the crossbar itself.
The spacing was based upon the width of the Blitz plastic gas cans with the self-venting cap.
The spacing worked out to accomadate three of the Blitz gas cans. (Sorry, I didn't have a third one for the photo op.) Two cans can be individually ratchet-strapped . . . . or if three cans are used, a single rachet-strap can go through all three handles.
To test the integrity of this gas can rack mount set-up, I filled each can to capacity and drove the FJ to and from work. No shifting, no crossbar sagging, no spilling and no wind noise.
Short of upgrading to a heavy-duty aftermarket rack, this does the perfect job of supporting and carrying that additional 15+ gallons of spare gas.