I would suggest that if you never plan on using a tv in your trailer, there is no reason to lay out cash for the cable ready option. If you are concerned with resale value, this is such a trivial option that it will have pretty much zero impact on resale $$$. Buy a bottle of your favorite liquid refreshment instead and enjoy your new trailer.
2013 19' \ 2013 15B, 2020 Toyota 4Runner TRD Offroad
"It is better to remain silent at the risk of being thought a fool, than to talk and remove all doubt of it." - 1907, Maurice Switzer