Tempted by TM but have resevations.
1) Access - have worked someplaces where you would not have got your pipes in - totally secure, no doors or windows to be left open, usually at nighttime.
2) Security - your cleaning away merrily say 200 feet from your van on 1st floor when suddenly you loose power.
Look out the window and there goes your van.
3) Weather - Don't know about water cooled but assume with air cooled engines you need to leave the door open for circulation, exposing the engine to rain, sleet etc. And that also comes under security as some numptyhead is always going to want to tamper with it while walking past.
Just some thoughts of mine when I was considering one a couple of months back.
Think I might buy a top end spec porty instead, any ideas??
John