I have heard of clutch trouble in them also. I would never say the hilux was a tough vehicle, they are now a tradies ute that wont get stuck in mud on a building site and go well on the highway. The old Hiluxs had a tough drive line and no power, the new ones have heaps of power and the drive line and body is as weak as.
Those chips make em go like stink from what I have heard, but they use a shed load of fuel as well. Power needs fuel though.
I dont know if you can fit a Prado chip as I assume they must be different. They make power and torque but use the same amount of fuel.
Just stick a injected 350 in it Byron!