It seems to me your answer lies in what you wrote at the beginning of your email. Why not buy another Hilux, it did the job for you before and there's no reason it wouldn't do the same again.

IT'S hard to say how many are left, but one thing is certain, many have gone to that automotive graveyard in the sky. Given their numbers are thinning it's fair to say they will become collectable, and their value should go up. If you're thinking of buying one as a classic with the potential to increase in value, buy an SL/E.

MANY things can cause vibration. It could be as simple as poor wheel and tyre balance, which tends to show up at about 100km/h, or it could be the tailshaft, which shows up at a lower speed. Before doing anything drastic you need to check everything is within specification: wheel and tyre balance, tailshaft balance and driveline angles. The latter can be critical. If they are out they will cause a significant vibration.