[PaulF]

The larger the better. Years ago during the Dwarf project I tried five gallon buckets and they did OK. Then it was in a ten gallon container and OK but still the plants were smaller, the tomatoes also smaller and production less than the same varieties grown in the ground.

That said, I still say it will work in your situation. Like all container grown plants, remember to add a plant food every ten days or so since with watering the nutrients will wash out more easily. A lower nitrogen formula will allow the fruit to develop and grow. High N will make lots of foliage with no tomatoes.