Exterior body panels. Steel or aluminum?

[Mini2nut]

I have not seen any articles stating what alloy the exterior panels on the 4th Gen Tacoma are manufactured from. I did my own magnet test from front to back and found the following:

Hood: Aluminum
Fenders: Steel
Door skins: Steel
Roof: Steel
Bed sides: Aluminum
Tailgate: Aluminum

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[tacorancher]

Bedsides? Really? Wow.