Who provides the manuals?

You guy who work on a large variety of equipment, who provides the technical info? Do your customers provide a service manual or do you have to buy it? Some companies like Eaton and Genie are very open with their manuals and you can download them from their websites for free, but they are the exception.

I'm jealous of the auto repair guys who can subscribe to a service like Alldata or Mitchell and get any info they want on any make a model of car you can imagine.

Who provides the manuals?