yes, I think people see a Motorhome and think you have money... but I don't think it truly affects a professional quote for service. As many have said, there are lots of costs involved in many trades beyond what you see up front.
My son works for a tree service and has mentioned the amount of equipment they have (bucket trucks, dump trucks, excavators, and tons of smaller items). these trucks don't get very good gas mileage and have to travel to job site and be operated by skilled operators. expenses like workman's comp are unbelievable and then payroll cost to have the skilled operators show up to do dangerous work in all types of weather is also prohibitive.