Ok, I did find this in an Allied intelligence brief:
Although the tubes are mounted on a two-wheeled carriage with a split trail, the whole apparatus is so light that two men can manhandle it easily.
So that would lead to them being able to move around on foot, but they are still fired as artillery. So if I were to allow them I would restrict them to firing as artillery and not used for house clearing room to room which is what everyone uses them for. Thus a minimum range would be required, I would say at least 2 hexes.
http://www.lonesentry.com/articles/rocket/index.html
I would say the satchel charge is designed for use in combat to clear obstacles, bunkers, etc in hurry and under fire, while the demolition charge is more for clearing obstacles not in combat. Kind of weak, but from what I read that is basically it. But in game terms, no difference.
Some of us are busy doing things; some of us are busy complaining - Debasish Mridha