The answer is obvious to anyone who has seen a truck up close.
There are only a few inches of clearance between the top of the tank and the bottom of the cab. There is simply no room to access the top of the tank...even the fuel fill caps have to be offset a bit to allow the nozzles to get into the tank and still clear the cab.
Thus, any maintenance to the tank requires the removal of up to 120 gallons of diesel before removing the straps and dismounting the tank.
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