Polaris has had them for a long while for the rear racks of the four wheelers. I been wanting to put one along the back seat of the jeep.
BTW, CARB is such BS, all the CARB cans I have used spill more fuel than a 1950's can. I was gettin a bit jacked this summer as I was watching my $4.00 + / gal gas, running to the ground, While trying to fill the lawn mower. Oh the joys of uncle pricking us.