The Toyota has a real problem with the cooling system design for several reasons.
Air Flow and Radiator Style are the biggest.

The Nissan and TCM both have Nissan Engines, High Volume Fan Blades, and a Large Fin Radiator.

Try changing the radiator to a Cotton Core,
and change the fan blade if one is avaliable. If the muffler obstructs the flow or is too close to the radiator either move it or wrap it. In the old days adding some Wynn's Super Cool to the anti-freeze made a world of difference. They don't make the same product now but the local Wnyy's distributor will know what to use if you contact them.