As camp hosts, we see many campers that pull their tt or 5th wheel with their pickup trucks advertising their business. I don't know how they could keep you have having a business name/logo and type of service the business is on your vehicle. They will not however let you put a sign up on your site. This may work if you park someplace for a few months at a time. I have also seen ads on Craigslist under the rv section for mobile tech service. We have not needed mobile service --- keep fingers crossed....but we would certainly use one if the person was experienced and could show some type of licensing, certification.