I had a tomato weizen once, it was catastrophic. Don't do it. It was truly the worst beer I've ever had. I can't even express how horrible it was. Well, I suggested to the brewer that he turn in his brewing gear, does that give you an idea?
It wasn't that he brewed it, we all have crazy ideas that don't turn out to be good in retrospect. The problem was that he brought a keg of it to a meeting as if it was something good, as opposed to as a cautionary tale.
If you like a beer with tomato juice in it, blend it in the glass.
Or, screw it, ferment it, but don't say I didn't warn you. While you're at it throw a couple of pounds of peated malt in it, it can't make it any worse. Probably.