If you can’t find the answer here, you don’t have a problem, LOL! (Look at the pix of fungal and viral problems.)
My guess is blight, but it could also just be weather related because it has been one cool and dry summer in a lot of the USA.
Blight starts from the top of the plant and wilt starts from the bottom, usually.
http://www.avrdc.org/photos/tomato_diseases/index.html
Thanks for the link. bookmarked.