Operational expenses are part of doing business, so using the cost of gas as a reason that no one will come out is, IMO, weak. Where do you live?
Have you considered pulling your trailer over to an electrician’s shop, so that his gas doesn’t figure into it?
Do you have a school close to you that has an electrical program? If so, call the instructor to see if your project could be done by the class.
Do you have an electrical supply store near you? If so, they will probably tell you exactly what you need to do, and how to do it.