|Name||ShelfTrack 84 in. Nickel Standard||ShelfTrack 84 in. x 1 in. White Standard||ShelfTrack 80 in. Nickel Hang Track|
|Compatible With Material||Metal/Wire||Metal/Wire||Metal/Wire|
|Accessory Type||Track/Rail||Shelf Tracks,Shelving Hardware||Track/Rail|
|Number of Brackets||1||0||1|
|View Product||View Product||View Product|
You answered your own question. an 84" standarf gives you maximum flexibility
If you are focused on mounting into studs, 1/4 is more than adequate. The top support track should be connected to each stud it passes, or a minimum of three. Disclaimer: I am not a pro, but appreciate the value of the product being discussed.
Instruction says up to 400 pounds.
5/8ths of an inch
The horizontal hang track allows for flexibility in the spacing between the verticals and does give weight-bearing support but I think you are the only one that can answer your question. If you want to make it as strong as possible, use screws into suds on the verticals. The horizontal track does mean that less mounting points may be necessary on the verticals. There is no time that i would recommend mounting into the sheetrock without the appropriate anchor. If you are going to secure it (recommended) then do it right.
Not from the store. Silver and white
I have not seen any wood shelf systems that don't have their own brackets. You could however cut a dado in a wood corbel and slide it over the metal brackets these are designed for, giving it a more wooden shelf look. Just a thought.
Even if you get a secure mounting to the door, the weight will likely pull the door out of alignment eventually causing it to be difficult to close.
Yes, you can order it from home depot!
The weight supportable depends on how many vertical struts you mount, and how you mount them. I have always mounted struts into every stud with 3" screws along the horizontal runs. Currently I have struts mounted across five studs (overhanging a bit on both ends, with eight shelves spanning the struts, and a FULL load of books on each shelf, easily topping several hundred pounds of load on mostly 6" arms. They've been securely hanging there for months, and I don't anticipate any issues. (I had basically the same installation in my former abode for over 25 years.)