Truck shut off on while driving on the freeway?

Hello,
The fuel pressure should be 55-62 PSI with key on and engine off.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

It sounds like you might have a faulty crank position sensor.
When a crank position sensor goes bad, the engine can stall without any warning and usually you won't be able to start it back up. Sometime it might start when the engine cools down some.

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works
https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

On this vehicle you will have to remove the starter to access the crank sensor.

I have attached the replacement procedure for your reference.

Please let me know of any questions.

Thank you.