I'm in the process of purchasing at Fifth wheel camper. The units I'm looking at are between 44' and 46' the back up camera system I recieved with the truck only has 50' of coax cable with it. By the time I run it from middle of upper rear over and down to the under belly it'll use up about 13' before it's running the length which isn't the whole 44' but will be roughly 38' to 40' plus need a little slack for maneuvering. Is there an extension for the wiring available? Can I splice something to extend it? Thanks for any input.