Jesse,
I have a travel trailer that I intend to do the same thing with. I bought it (used) with a digital dish on top, but no receiver. There are some considerations to using your home receiver elsewhere.
The main one that I know of is that your receiver is hooked to a telephone line. My understanding is that this is strictly for the pay-per-view movies and sports, but there may be more to it than that. I do know that the receiver occasionally dials the Direct TV data line (an 800 number) to report usage. (Maybe Direct TV is monitoring more than movies, for all I know. ) When the receiver places this call, Direct TV's home office gets the caller ID. If the phone number is not the one that you gave Direct TV when you set up service, they get upset. The way they figure it, you have taken your receiver to someone else's house (who doesn't pay for Direct TV service) and are letting them use it.
I am told that you can go for a week or two without having your receiver hooked to a phone line, but after a time Direct TV will do something with your service. This might be shutting you off from pay-per-view access, or it might even be shutting off your service entirely. I don't know.
If you discuss this with a Direct TV sales person, you might get a better understanding of their system, and be able to see how to use it without problems.
I hope it works, because I will be doing it myself on our next trip.
Loren
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2000 Quad Cab, 4x4, short bed, six-speed: U. S. Gear exhaust brake, MileMarker Select Drive viscous coupling, Velvet-Ride spring shackles, Painless Wiring circuit box, Optima yellow-top batteries, Super-Glide 5th wheel hitch, Reese folding ball gooseneck hitch, Drawtite front hitch receiver, Tekonsha Sentinel brake controller, Westin nerf bars, Clarion sound system
1995 Standard Cab, 4x4, long bed, automatic: Firestone Ride-Rite air springs, torque converter lock-up switch, 4" cat-back exhaust, Reese 20K 5th wheel hitch, Reese gooseneck hitch, Hayes Micro Control trailer brake controller, 100 gallon bed-mounted fuel tank with 12 volt electric pump & fill nozzle, Swiss Cap fiberglass cap