tigglys,

The Beech Model 34 Twin Quad was a four-engine arrangement driving two
props (so it looked like a twin). It had a V tail. One prototype was
built and was destroyed in a takeoff crash in 1949.

For some reason I'm thinking there was a version of the Model 18 (Twin
Beech) that had an experimental V tail on it, but I don't think it was
ever produced.

There may have been a prototype Travel Air or Baron with a V tail, but
I don't recall. I'd recommend a web search of Beechcraft history.

All the best,
Rick