I have a rear bumper with a basket for duel jerry cans (Dobinsons rear bumper), and I was just wanting to get a consensus on what jerry cans to buy. So basically metal vs. plastic. On Amazon they're wanting $180 for two 5.3 gal. metal cans, and the plastic "water" cans of basically the same size are about $100. Cost is not really an issue here, I'm just wondering about metal vs. plastic with regards to metal rusting from the inside with condensation. Has anyone had issues with the metal cans and if so, what issues could I expect? For that matter, what about issues with plastic cans?