Stay with the late model Chevy or GMC trucks and it's pretty much a bolt-in. Some new drilling may be required.
Two things though. It seems you are concerned about safety wanting three-point belts. In that case consider using Juliano's seat belt anchors to mount the seat. They guarentee them to NOT pull through the floor in the event of a collision.
The other thing? It's just my opinion, but I think the late model seats, with built-in restraints and tall backs, look goofy in our trucks, especially if you have a big back windowed cab. BUT,, they are better from a personal protection standpoint...
dv