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This probably doesn't affect you, but there is a cluck that affects over a decade of S-10s and Sonomas. Bad bolt and washer on the hood hinge. Factory recall. Just takes a lock washer and the cluck goes away.
It doesn't take much to be annoying, but that clunk could be anything between 2 metal surfaces. Don't rule anything out, or anything in. If it's so random than you can't use a known pothole to recreate it while driving, its most likely not a suspension part.
The light clunk could be your transmission if it only happens from a dead stop. First gear engagement from within. Jack the truck up, lightly set the e-brake (for resistance) and drive. If the clunk is there, drivetrain. If not, suspension or something else loose.
If you're not stepping on it I highly doubt a bad motor mount. its possible, but every vehicle I've owned requires/required flexing the muscle to damage mounts. I can't imagine your Tundra is that big a POS that it flexes with hypermiling techniques.
If you can remember what you were doing--ie speed, gear, throttle, direction, location--and mimic that and not get the same results, you have a POS. If that's the case I would trade it in.
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