I tightened my torsion bars back in February to raise the front up where my H would sit level. Over time it has sagged and is almost sitting stock. Raising torsion again would probably require realignment, but on the other hand a leveling kit would be a one time process

 

Mine hasn't sagged and I've put on good miles and offroading. Haven't heard that problem before.

You may also want to read this FAQ:
https://www.hummerforums.com/m_85049/tm.htm

 

[&o][&o] A kit won't do anything for you that a T Bar adjustment can't. If you need a kit to re-index the T Bars, you have bigger problems than you think.