If you are going to being putting a 30 gallon tank in and only plan a few trips where you may need a little extra how about a gas can or two secured in the bed in case you need a few extra gallons. 30+ gallons should be fine for normal driving.
naw i hate that. the places i go and the way i drive everything bumps all over the place and the can always leak all over the spare, jack, chain box, coolers, boots etc. too messy and pointless for me
Yeah you just need to switch out that blank plate for one with a switch on it and you'll be in business. You can find it at a junkyard or probably on rockauto.com