First, the vehicle tire placard might be on the door itself.
Second, there are so many different configurations for "2000 Chevy Silverado 1/2 ton Pickup" that is almost impossible to figure out what you have and what the placard would have said.
So spend some time looking for the placard. It is the best source of information.
But assuming that it has fallen off:
1) Is the vehicle a 4X2 or a 4X4?
2) Regular Cab or Extended Cab?
3) Long Box or Short Box?
4) 1500 or 2500 or 3500?
Lastly, I suspect the vehicle placard said P235/75R16 106S. It is NOT an "LT", it is a "P". LT tires will be dual labeled like this: 110/106Q (with a couple of exceptions!)
:

ssst! LT235/75R16's don't exist!::
And since it is a "P", that means the vehicle tire placard will say to use 35 psi (according to Tire Guides).