Raised bed gardens?

[Jimmy]

It can work in 5 gallon buckets. Just make sure you have drain holes on the bottom, and get a determinate tomato not an indeterminate.

It's all about the right amount of water and sun, and some decent soil.

 

[Rokbar]

I saw where one guy would take the used rubber tracks off mini-excavators and use for raised beds. They are heavy though.

 

[Rbyrd]

Check out grass roots fabric beds. They work great. The are fabric with a pvc frame mine hold up well in my greenhouse.