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No special tool are required. I use a floor jack to help support the tank, depending on the amount of fuel in it. It might not hurt to have the locking rings that hold the senders in, they can be a beach to get loose, if they are rusted in place. The shower head can rot off leaving you stranded at around 1/4 tank showing on the gauge. Some say it is easier to remove the bed to service the tanks, but I have always taken them out of the bottom.
I use ratchet straps, less balancing when the fuel is sloshing around but floor jack is a good way too. Watch for fuel lines an sensor wires as you lower and raise. Vacuum all the crud before you open it up. Liberally apply patience and common sense as needed.
Okay, that rules out one common thing, the strainer aka "showerhead" falling off; that results in the truck not running when the tank goes below 1/4 tank. Draining the tank is gonna be tricky, if indeed the strainer is clogged. 3/4 tank of diesel should weigh about 100 lb; the tank itself is pretty light. You might be able to put a couple of adjustable nylon straps under it, hooked to the frame, and gradually loosen the straps to lower it to the ground.
Pull the bed. It's not that hard & easier to get to the tanks in place from the top. You can also mod the vents and fill necks at the same time, easier fill up. You can extend the pickups & remove the plastic pickup / showerhead whatever you want to call it. Did mine this way after I put in the 38 gal rear tank & had a problem w/ pickup & gauge.
Use a board under the tank and a floor jake, no problem. Use a tool like Alex linked but with a bigger flange on it for leverage in pushing it in. No telling what you'll find with the sending unit, a new one is expensive and hard to find. Good Luck and where have you been???????
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