[arethuza]

"small forests and unclaimed land from trash"

Sounds like a slightly different approach - rather than having a vacuum cleaner of wheels (which can't go off-road). Have an "industrial" version of a standard canister/cylinder cleaner with a very long hose that can be used to clean grass/bushes.

Sounds like a pretty good idea to me!

[Uchikoma]

Yes, this is used here too, looks like a truck with a vacuum cleaner for offroad, forrest or side of the road. Don't know about cleaning bushed though :-)