Somehow I knew I would get a post like yours....yes, you are missing something. Garbage truck=bobtail with bed, mud from land-fill, leaking garbage. Vacuum truck=off the road a lot, lots of leaks from pump and rear-end housing, lots of build up...vacuum trailer, 40 foot long, all the mud and dirt from truck is sprayed up and down both sides of the trailer...not to mention the top of the trailer where all the seals are and the front pot where there's always major build-up. Oh yeah, and then there's the railings on the cat-walks of the trailer..they catch everything. To answer your first question, yes, they do require recovery. Not only that, there shop is in the middle of a large production field and the epa is always running around so it would be stupid not to consider this. To add to this, I also turned down a large account last month because of recovery concerns.