I always carry a couple of RG cables for TV hookup at the pedestal and use a TV splitter. Run one RG cable to the CABLE hookup and throw the other RG cable under the trailer to use in the outside patio area etc...
If you want to professional install an external setup You can find the external weather tight TYPE F connectors at LOWES or AMAZON to install on the side of your trailer... They have short runs of RG cable, adapters, etc... as well.

You will have to tap into the TV cabling somewhere and install another TV splitter. I'd probably pick the line feeding the bedroom... The simple TV WIRING will look something like this in the typical trailer... You will be on your own figuring out the mass of wiring etx in the big MHs...

Roy Ken