I doubt this truck will last until 300k miles.  It depends on circumstances.
In a truck, you can drop the tank, lift the bed, or cut a hole in the bed.
I would recommend this method for any vehicle if it provides access to the
pump, and the hole can be covered with a panel the way I did my truck.
Other parts can break and leave me afoot, but I was especially worried about
the fuel pump.  They very seldom sputter and let you get home with it.  They
are priced as if they are made of gold and labor is high.  I bought mine on
EBay for about a third of the cost of a new one.  I saved the tow bill and
labor so for me, this was worth it.  Once, I was on a trip, and the fan belt
tensioner came apart.  Of course I didn't have a spare (I still don't) but I
got a ride to town and bought one.  It was a ten minute repair.  There's no
way to carry a spare for everything.  I have a first aid kit, road
reflectors, fuses, and my old fan belt.  The manufacturer gave me a spare
tire.  I've used it twice.  All of this is just my story.  Maybe I was a
little crazy for carrying a fuel pump around for all this time.  Maybe not.
. . .