Your best bet is to get the 32 gallon tank, that is an option for Generation 4 Rams
That is almost
the cheapest way to go & will give you another 60 - 80 miles per fill up
The most practical & cheapest way & is to get some plastic fuel cans, i used to use cans used in boats, 6 gallons each, i used the low profile containers, but, they make them taller & thinner also. The people that spend weekends out in the desert, use the metal jerry cans
. I liked the plastic because they don't scratch the paint & don't bang around.
The way i transferred the fuel was by using the handiest hose device that i think everyone should have at least one of, is called
Super Siphon Hose - Safely and Easily Transfer Liquids! Siphoning has never been easier!
Transfer a 5 gallon container of gas in less than 1 ½ min, without any dripping
The Super Siphon safely transfers gas to your boat, Jet Ski, or even your lawnmower without the danger of spilling. Empty out the bilge or the bottom of your boat, with just a few quick shakes to start the siphoning. Great for transferring diesel, paint, or oil.
Just drop the pump end, which works like a check valve, into whatever liquid you want to siphon and snap the hose up and down a few times to start the flow. As you snap the hose down into the liquid, the check valve allows the liquid in the hose, but not back out. When enough liquid gets into the hose, the Super Siphon -ing effect takes over, and the liquid starts flowing. Siphoning has never been easier!
quick video of making it work
I use the 3/4" pinkish orange siphon, they also come in 1/2" blue & 3/8" clear
the hose measurement is INNER diameter
I forget where i bought mine, but, here is 1 supplier
As for a transfer tank, better check your States SMOG LAWS, in California you can NOT legally connect into your fuel system, unless your running diesel, with out a second charcoal canister & all that goes with that. I now have a 30 gallon auxiliary tank/toolbox, with its own pump.. $1600. +