I have 2 summits that are hang ons. I think they are called copper heads. They utilize a completely different system than the cable system. I dont think they are available anymore, but you might be able to find them used.

These guys make a ladderstand that goes almost 18 feet. http://www.gomuddy.com/shopping/Depa...DER-STAND.aspx

They also make a very nice and lighweight harness. http://www.gomuddy.com/shopping/Depa...d-Harness.aspx

If you are looking for a comfortable and wide stand that goes 20 feet take a look at this one.

http://www.cabelas.com/cabelas/en/te...233&hasJS=true


Heres a 22 foot ladder, although it doesnt look as nice as the XL.
http://www.cabelas.com/cabelas/en/te...0068162418892a