I have a 4’x 7′ garden, which I know isn’t much room, but I wanted to grow watermelons, honeydew melons, cantaloupe, and cucumber. I am going to grow them on a trellis, which needs enough strength to support these types of plants. I want a style of trellis that I can easily access the fruits without having to crawl or reach under and squeeze between the frame of the structure. I have looked at A-Frame structures, Arches, Pyramids, and a few other types of structures, but I wanted to know which one would work best as far as accessibility given the space that I have.
Certainly the vegetable you are growing will be the biggest deciding factor on the trellis system that you use.
These links will help you.