I don't have a Surly LHT, but I use the Pletscher two legged kickstand every day on my commuter, a converted MTB. I wouldn't go back to not having a kickstand. I pulled it off my tourer (also a converted MTB, older, with long chainstays) while I am rebuilding it, but I'll be getting another one for it once I get the time and money to get that bike back together.

I find having a kickstand extremely helpful, especially when touring. Not having to try and find something to lean the bike against is really helpful, especially if you are just stopping to get something out of one of the panniers. It's a big help when loading and unloading the bike too. I don't think the Pletscher is all that heavy, especially compared to other two legged kickstands.

I do recommend getting the accessory plate that some places sell for it. This keeps the kickstand from eventually spinning around on you. It probably helps distribute the weight a little better too.

It's probably available elsewhere, but this is one place that I know has it:
http://www.rivbike.com/product-p/k5.htm

Besides, if you have a two legged kickstand, you can do this! -
http://img827.imageshack.us/img827/1...3936651060.jpg