The wall jacks that OC displayed only have two small 1/2" - 3/4"holes behind them (and two smaller holes for the screws). One for each cable. Typically, one is for satellite (whether you ever use it or not) and the other is for the cable connection. There should be a matching internal plate like this.
When you go to sell it, someone might question poor work or installation if you don't have two connections at both ends.
If you only want to wire the one cable, I would suggest something like this instead.
PRIME PRODUCTS 08-6208 - Prime Products Cable TV Receptacle, Round, White 08-6208 - RV Plus
You will still need a plate on the inside of the RV.
Either way, you should make sure the F connectors are waterproof and tight. The plate on my trailer had two seals. One was some material similar to plumbers putty and it was further inside on the plate. Then the exterior perimeter was caulked. As for the cable, you can get an inexpensive waterproof cable connection tool at HD, Lowes (and last I checked at Harbor Freight). Edit: Found the link: http://www.harborfreight.com/coaxial...ool-95862.html
Use RG6 Cable inside the walls/trailer. You can buy it at HD, Lowes or just about any other hardware store, but HD and Lowes will sell it to you by the foot.