Some pickups & Travelalls have fuel tanks under the cab with passenger side mount/fill...some have them on the driver's side...some have tanks under/behind the rear fender...and some have multiple tanks. Just as a little background on why this is so: One of the really, really neat things about IH vehicles...and one of the contributing factors to the Light Line demise...is that there were literally hundreds of build options for just the body & chassis, with extensive "custom" body options available from the factories themselves. Of course one could always go to a custom body/coach builder like Boyertown as well. IH, as an overall view, considered that the Light Line would be used for commercial use just as much as the big trucks, and built/offered accordingly. Of course, to an extent, the case can be made that they bled certain medium-duty parts down to the Light Line as a production economy. Good for the consumer, not so good for the corporate bottom line. One great example was the use of the 266/304/345/392 engines...built for high mileage use and rough conditions, but overkill for 1/2 ton-1 ton trucks. I've torn down 345 engines with literally no bore wear and still having honing crosshatch, with over 100K miles.