Goodyear "billboards" for sure, check out a thread on here "Goodyear billboards in motion" or something like that, that alone will convince you.
If you still are worried, go to
www.finishline.com and look under"vintage decals" then scroll down to tire stencil's. They have goodyear, avon, and firestone stencil's. I've heard of someone having avon rubber but put Goodyear stencil on there tires
I don't worry about having the "billboards". I truly think law enforcement has other (better) things to worry about than our tires. And like Red said above..if they are on there hands and knees checking out your tires...your in trouble anyways!
Plenty of threads about these tires. Do a search.
Chris