In bed tanks are usually a DOT approved system. If you load up that plastic tank that has no baffles you will create a sloshing motion while moveing which will create foaming ,which needs some sort of pressure release. I beleive your fill area will be belching diesel as you drive down the road and when you stop. I agree with all the above posts its made for water,a little in the tank while you are traveling, or a full tank if you are off to a rustic campsite. If you develop a leak or if pressure causes that diesel to leak you could face some big time clean up cost.
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