It is not uncommon to have an undercoating in areas that are exposed and that could rust. As other people have mentioned, skid plates are totally a thing too. If you really wanted though, you could have bed liner material applied to the underside of your car. It’s not going to make a big difference, but it could protect against corrosion and reduce damage from road-bed collisions or collisions with small objects that your car may drive over.
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