I am kind of the night watchmen for my family business. I live in a 5th wheel camping trailer at the back of the property, and the modem is at the front in the office. I want Internet in my trailer, but I have to go about 300 feet between modem and trailer. So I figure wireless is out of the picture, because we have a garage type building that takes up most if not all of the distance. With cable, what's my best bet to go the 300 feet?