Just to clarify what the Captain is saying here; A truck tyre must only ever be inflated in a properly constructed cage by a qualified technician or experience operator to prevent injury from a bead or split rim failure.
If you're thinking of doing it yourself without the proper equipment I suggest watching this video first
Don't clarify what I'm saying if you haven't got a clue what you're talking about.
Truck tires are inflated while on the truck all the time.
Have you EVER seen ANYONE remove a tire and put it in a cage just to inflate it?
No. You haven't.
You're thinking of seating the bead when mounting a tire to a wheel. And on truck tires, even that is routinely done completely manually, with a big pry bar, then the bead is seated by blasting it with air from a portable tank fitted with a large dump valve. There isn't enough air in the portable tank to make a huge tire explosion. Then you just inflate it as normal, like you and everyone else on earth does.