. . . or connect your DISH Hopper to a WiFi hotspot and download Video-On-Demand (VOD) movies. The movie you select downloads via your sat dish, not via the WiFi hotspot.
. . . or while you're in town, find a free WiFi hotspot, download a movie to your iPhone or iPad, and use Apple's built-in AirPlay to stream the movie to your RV's TV. (WiFi hotspot required + TV must be connected to an AIrPlay device like an AppleTV).
There are many ways to skin this cat besides using up umpteen GBs of your broadband data.