Buddy of mine has a ATTA Tank, 80 gals for his short bed LML. Its wired up so he can turn it on, off, or auto. Auto keeps the factory tank between 1/4 and 3/4 full. He also has a mounted on his dash for fuel level in the tank. Paid about $1800 for it installed though. No gauge issues and he burns though a few tanks a week sometimes.
I am not sure on the fords, but for the GMs you can get a Titian Tank. They fit in the stock location, and are much larger. I would go from a 34 gal to a 62 gal on mine.