I still say cherry toms will do best. Romas will work if you pick them mature but not "red ripe". Once they get ripe they form a strong abcision layer and tend to shatter in windy conditions. I used 5gal buckets, hung by the bail off of lags screwed into the headers in some pole buildings. They received full sun, and needed watering at least once per day. Buckets with media or soil, plants, fruits, and water add up to one heavy object. I would have faith in the right aircraft cable, but I think 50 buckets would require fenceposts the size/depth of telephone poles with a few intermediates, otherwise the contraption may fold up mid season. I planted in buckets just as an experiment, I don't think I would do it again. I tried several different tomatoes, eggplant, and cukes. They seemed like appropriate candidates for such a system. See what you think. I've got a plastic mulch layer and water wheel planter, I don't think anything could beat that setup for my needs. Try the buckets for yourself, it's a good experience, just not something I'd do again. I did find one "bucket garden" application that I really like, can't be beat in my opinion... it's called growing carrots. A nice peat media can be used, seed the carrots thick. When they start to crowd, thin them out enjoying the tastiest baby carrots you've ever tasted. Let the remainders grow into the straightest, EASIEST TO PULL carrots you'll ever have. Don't hang carrot buckets, I think the bucket gets too warm. Set them on the ground in stead. I won't even try to grow carrots in our rocky ground anymore- too twisty, forked, and hard to pull. Rocky soil is much better suited to garlic, spuds, and ginseng, stuff you dig rather than pull.