Diesel coolant may work, what is that borate chemistry? BUT the truck came from the factory with Toyota red which is phosphate. The phosphate works great for all the metals, iron block, aluminum heads, and the brass radiator if you still have the factork kind.
I would double check the diesel coolant will protect the aluminum as diesels usually don't have it in the cooling system. Definitely don't use regular Dex clone stuff or silicate green, that's how people rust up their iron blocks.
This is the advice I got when looking for the best coolant for my Toyota pickup with the 22R.