I use 4ft 1" straps and carry two dynaglide suspension extensions and in the past two years I have maybe used the extensions a half-dozen times (probably less) thats about 8 trips with each lasting around 3-5 days, this was all primarily on the AT!
I have a set of 2ft and 3ft ft straps and most times I find myself packing the 4's! I have taken the 2's out and have almost always had to use the extension's, but then I have to find trail sticks and place them in-between the tree and extension to not damage the tree with the dynaglide extension, also finding tree's that the 2's can fit around and are proper distance away, and not a lot of crap under the hammock, and more I found they became more of a problem for me! The 3's were pretty much the same as the two's but slightly less time having to use the extensions! All in all, I found a happy medium with the 4's!
For a SUL rig you could just use 7/64th amsteel (or dynaglide) and tie marlin spikes using trail sticks every 6-8" or so for tree protection and just wrap that around the tree!
Formerly known as "Cranky Bear"....
"yesterday is history, tomorrow is a mystery, but today is a gift---thats why its called a present" - Master Oogway
It's always best if your an early riser!
I like hiking as it's like exercise!