flowerbug
Garden Master
I like this idea. Moving around the trellises is a pain!
you say sand mountain and you had a lot of rot troubles with the tomatoes, but i'm not sure if that is related to disease, animal or bug damage, weather damage or what?
if it is something like BER kind of damage you can moderate that by amending your sand with some clay and organic materials which will give you more even water availability. organic materials alone will help for sure, but the clay makes whatever else you add go that much further.