Youre talking about the articulated municipal tractors?
Theyre common. Lots of available options, from dump bodys to flails to sweepers to boom mounted mowers and snowblowers. They have decent NA distribution so parts shouldnt be an issue (at least for newer ones) but being German (and industrial duty) they could be very expensive..Holder Tractors: Homepage
If a muni tractor is something your interested in, look for a Trackless. Parts availability is way better. All off the shelf NA parts. Cummins engine, Danfoss hyd, Dana Axles.
Its sort of like comparing a Mercedes to a pickup.