You will need a portable satellite dish and tripod. This is the best tripod I've found for leveling. A friend just got one and said it solved his problem, coupled with the satellite meter that they sell:
You will need enough RG6 coax with F connectors to get from the dish location at the campsite, to the television/receiver in the trailer. You will have to have a SwM module.
Buy all that one time, learn how to direct the portable satellite (I'm still learning, but others master it fine), take any receiver from home (other than a Genie Client), and it won't cost you anything.
IF you need an extra receiver for camping, add one at your DirecTV account online, order it, and it's $7.00 per month once activated.