RVs have had RG6 cable for 10 to 15 years. Suspect you'll be fine. You can use a diplexer on a sat dish cable but not just an old style splitter. A diplexer costs about a $1. Usually the biggest problem is checking where each cable goes. I use the diplexer on the back of the dish receiver so I can feed in either the portable dish or park cable on the same cable. If you use a diplexer the outputs are specifically labeled. Not interchangeable. On previous posts when they say no splitter they are referring to the old style splitter that has been around for years not the diplexer.
