Best I know is that full pallets are of a single size. If you happen to need full pallets of each size, the answer is yes. However, you may order each size by count to be stacked onto one pallet for delivery, that's possible. But the pricing may not be the same for bulk.
You need to level and put down some sort of base sand or better would be to use paver base then sand on top to level you can do it with out any but leveling will be harder
I'm not sure what you're asking but this stone is 3.5" thick by 10.5" long by 7" wide. There are 3 or 4 different sizes of stone and all the dimensions are multiples of 3.5" making it simple lay without having to cut the stones. There are brochures at HD and videos online that show very creative usage of the product. I used them for 21" tall columns for my yard lights.
Absolutely. They are strong. You need a good base, though, so they don't sink in.
You can only get Fire Brick from a Brick Dealer.
3.5 thick, as it says at the top of this page.
I think the square shapes create a more stable structure than the rectangles. When you stack the rectangles up, they seem to want to tip over sideways. The square blocks have no "sideways" thereby creating a stable base. You could mix and match to see what works best in your situation. Start the bottom layer 3 or 4 blocks wide, then set back each row a little, shortening the width as you go, till you have only 1 block wide in the top row. The wide base will give it more stability, and "lean" into the dirt being retained. Don't forget to put a thick layer of gravel behind the wall before backfilling with dirt. This will give a way for water to drain out sideways instead of pushing on the wall and possibly ruining the whole thing. I've seen drainpipes added in the middle of solid concrete walls to prevent the water from cracking them in an attempt to flow downhill. For a wall 60 feet long, I would recommend 3 drainholes spaced along the length and about a foot below the level of retained earth. You could get really creative with the really long thick bricks lining a small opening, with chicken wire in front to hold in the gravel or small pebbles lining your "drainpipe".
I once had a whole buildings worth of materials delivered for free in the Poconos, 45 min. from the store. ASK and you will receive! Don't forget the sand to sweep into the cracks after they are all laid. This helps keep them from shifting with use.
Yes for $659.00 a pallet of 96 not the same price as an individual $3.10 a piece or $297.60 for 96 individual pavers
Yes. They are made of concrete! They will blacken. But that just shouldn't damage their integrity. If you are working with a curve, use the squares. The long rectangles might crack through the middle with heat and stress. I dunno....