Do you have a booster that will get internet from my house to my trailer about 50 feet away?
The easiest way to extend wireless coverage is to purchase a device called a wireless network extender. ASUS makes them, they cost around $100 or so. There is no wiring involved, you just locate the extender in an area that can receive the wireless signal from your wireless router, and go through the setup. Be sure to set it up so there is security, with a strong password.
If your trailer is made with metal/aluminum siding, it will be a type of Faraday shield that may make WiFi not work very well. If your house has metal siding or stucco, it too is a Faraday cage doubling your risk of failure using WiFi.
Power line adapters are superior in those situations. Your trailer will probably get power from the same source as your house and so these should work well. Your neighbors down the street on a different utility transformer are out of luck if they want your data, and these things are encrypted too, with just a push of a button.