I don't carry tools because I do not trust the Supra. I carry them because I like to be prepared for most situations. I keep a cheap tool kit in one of those compact tool carriers, a blanket, jumper cables, flares, flashlight, can of fix-a-flat, etc. This has been standard travel equipment for all my cars.
And really the only thing you need to take apart the majority of the engine is a 10mm, 12mm, 14mm, ratchet wrenches. Toyota was nice like that.