No, I haven't seen a single good thread on the timing chain. Use the Chiltons, it'll get you through.
This is the skinny, and why I recommend you get in there and do it now if your aim is to keep the truck at 100% and drive it forever:
The chain is designed to last for the "life of the engine", which is 250k according to the Toyota engineers. You're close to 200k. At a minimum you need to get in there and check the plastic guides/tensioners. More than likely they are closed to cooked. Chain failure is rare, but IMO that's because there aren't too many guys driving them well over 300k, which you have the opportunity to do. Myself, I'd do it at 200k (now) and call it good until the motor or truck disintegrates. Means a little bit of work, but you're also starting to get into the motor, which will reveal any problems or potential problems with the added benefit of replacing old seals/gaskets.