I use a Titan Tank. Itís fantastic. It has a pump and automatically feeds with a push of a button dumps 5 Gal of fuel into my main tank. Itís puncture proof and low enough for my tonneau cover to close. Itís 40 Gal and extends my trip by aprox 400 miles. Hope this helps. We are in Canada so we are not allowed gravity fed fuel tanks. I have a 2017 Ram 3500 and itís great. A little pricy but worth the money. Not sure if these are rated for gas as I run diesel but check the web site. This is a really safe option as well. Hope this helps

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