I would consider the following.
• Do you want an extra 30 gals of gas behind you in the bed?
• What does and extra 240 lbs. of gas do to your max cargo capacity?
• If you saved 30 cents a gallon verses purchasing the gas on the road, you would need to purchase 1000 gallons to offset the cost of a $300.00 tank installation before you started saving money.
• At 10 mpg towing, your breakeven point on a $300.00 tank installation would be 10,000 towing miles; assuming you can save 30 cents a gallon.
• Optimistically 25 gals. in the truck tank and an additional 35 gals. in the bed; would get my rig about 600 miles before I needed to buy gas at the local price. 600 mile is less than half the distance to many of my camping distinations.
