Welcome to the forum!
FB is one of the things that happened to it, but also the original forum shut down, then a new one opened, after the sale of the company. Here is a link to the old forum archives, just so you can see some of the old posts, but you can't reply, and you can't do searches, just look around. And not everything comes up...not sure why. You may have already found this on the "Announcements".
http://web.archive.org/web/20161124203416/http://forum.earthbox.com:80/And somebody, when the new forum started up, collected a lot of the more useful threads and put them on here. The highlighted sections in the different categories are mostly those.
As for your questions, whatever you get for elevating the EB, be sure it is heavy duty, as a filled EB is HEAVY! Something to think about on roofs, too.
As for feeding, if you follow the instructions (if you didn't get instructions with it, the EB website gives the detailed instructions), with the strip of fertilizer, and the dolomite, there isn't much more you have to worry about, though a tip from Gardendoc works great for tomatoes: a tsp of calcium nitrate in the watering hole weekly helps with the Ca, as well as growth - a little "snack", as he puts it. I add some "snacks" from my hydroponics setup, to start them out, and maybe boost flowering, if necessary in some cases, but it is pretty much self-contained.
Good luck with your EB, and good luck finding the info you need.