Thats a couple good points that i wouldnt mind having is a transfer tank for other things (race truck) and what not. plus i dont really need 50 gallons of fuel all the time nore do i want to spend 200 bucks every time i fill. If it had the tool box on top that would be alright with me, i guess i have some thinking to do, damn you jacob
A few counterpoints to this:
1) You don't have to fill it all the way up every time.
2) You'll spend the money on fuel regardless - either $75-100 at a time more frequently or $200-250 over longer intervals.
3) You'll never regret having too much fuel.
I've got a TFI toolbox/tank combo that carries 40 extra gallons. I wish I'd have gone bigger on the tank, but carrying 70 total gallons lets you bypass most of the price gouging and fill at the price you want. 18.5k GCVW for 4,000 miles and I only had to fill up once a day, even the day we crossed the Rockies and ran over 500 miles.