Magnetic armor? Wow. I guess as others have posted, as long as it covers everything, your good. My "Volunteer" placards are pretty big and created nice clean spots in the bush marks. I think something like body wrap down the sides and across the front would work. The DIY stuff isn't too pricey and might look nice if you got something that matches.
I'm buying a new Tacoma next month. This gives me something to look into.
Scott
EDIT: Ok. That stuffs cool. Looked at MEK and Smittybuilt. I like the way MEK covers but I prefer the plain black (I only looked at TJ).
No one makes it for Toyota though.
Looks like I have a new project to research.