There should be a cable jack on the side of your rig (but I have read some particullar models dont have one?) and one inside. Also, bring your own coax (RG-6 type, not RG-59 if possible) i'd say 20-30' or whatever you know would reach and still have some extra. sometimes the CG will "rent" out some coax for you to use but might aswell just buy your own.
*Currently trailer-less but shopping
07' GMC Envoy w/ P2 controller (current TV)
88' Chevy K5 Blazer (soon-to-be TV)
74' VW Superbeetle (1303)