As Liberty City is a dark city, full of rubish scum, dirt, waste all around, without enough empty-spaced-dumpsters, would be nice if this job could be scripted.

Taking job (Getting Sanitation worker skin) -> Mission starts ( must be in Trashmaster to take it ) -> Circuit of checkpoints -> Cleaning Liberty City ( Collecting trash from each of checkpoints ) -> Driving the trash back to LC Waste places.
Would limit the work to minimal of two and maximal of 4 people able do it.
Also, yellow color could fit sanitation workers imho.
Let's see what you think of this, and if it's worth of further discussion.