If you can find some ameristep they make a great platform. I use 4 to 5 on a ratchet strap . They are a little pricey but are worth it . I like that I can walk all around the tree for a shot and they are lite.
I have read about the Ameristep option. Seems most people like them but they're expensive and hard to find. I'm hoping one of these new platform options will be liked just as well although maybe they won't allow the versatility and compact nature of the Ameristep. I'm anxiously waiting to see what they've come up with