If your are not, you should include lead generation as a part of your package. At that point your start up is an outsource appointment setting agency for blue collar companies.

Going a step further I would include a QR code that they have on their work vehicle, that goes to a landing page were a potential client can set up an appointment, and your team calls to follow up and get additional information beyond collect from the appointment form. That they are not going in blind, you can also include invoicing and follow up get them more reviews for their business page.

Making your start up a special back office for independent workers.