I think you folks should check with the varieties that Marv Meissner suggests since he wrote the book.
I could suggest some, perhaps I did earlier in this thread, I can't remember, but I still suggest looking at Marv suggestions and there are other links to a person who just grew THE biggest tomato which I'm sure you can find on Google.
https://www.google.com/search?q=Marv..._AUIBigA&dpr=1
Also check out the BIG Pumpkin site on Google where the BIG tomato folks hang out and wheel and deal seeds.
Carolyn