On Oct 12, 2012, at 5:39 PM, Jeff Schwaia <vw.doka@GMAIL.COM> wrote:

Don't knock plastic gas cans... I saw a set of Rotopax (www.rotopax.com) cans on a Syncro Westy a few months ago.  Very, very nice!  Dang things were nearly bullet proof.

Ya, the volks at GW has all their rigs outfitted with at least 4 stacked on their custom racks:
http://www.gowesty.com/ec_search_results.php?search_phrase=rotopax

I've got one 5 gal. metal can on my Gary Lee now and am considering getting Gary
to make a mod to allow stowing 4-across Rotopax. More convenient to deal with
than the weight of the 5 gal. tank. And, as you say, very robust. My metal tank has
expanded and the seam on the bottom of the tank is showing signs of bulging.

bob