Every drill truck pretty much I work with is a MAN well except for those doing the Tatra experiment which is a bit umm interesting. So the rig carrier, water truck and the air booster although these tend to be all 8by8's so I'd be kinda surprised if parts were hard to get. I suspect however whenever these come up for sale they tend to get sold to those in house or in the know.
Had grandious delusions of getting a 8by with a tilt tray and maybe a 3-5 tonne hiab and doing remote area recovery, then someone posted a picture of a MAN KAT!

