Ford Raptors have plenty of power and reliability is outstanding and this is coming from a GM guy.
That said prop it correctly and it will pull anything you can throw at it and I run the 400 in a heavier Supra SA.
I think the “electrical” issue you heard about was Moomba and Supra switching to a 240 amp alternator that had a wiring flaw from the factory. It’s an easy fix if your dealer knows what they are doing.
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2021 Supra SA 400
2018 Supra SA 400 (SOLD)
Michigan