Keep in mind that certain receivers require specific antenna equipment. If you want to be a Dish Network customer and use a Hopper, you must use a Trav'ler or a standard home style triple LNB antenna mounted on a tripod which you assemble/disassemble and point at each new location.
Dish also specifically states that they do not recommend and will not support a Hopper in an RV (the reason Winegard has that policy related to the Hopper). That does not mean it won't work but they appear to be concerned that movement in an RV while the 2TB hard drive is moving could cause damage.
For DirecTV, the comparable unit to the Hopper would be the Genie. The Genie will work with just about anything but requires the DirecTV SWM technology. The Trav'ler has this built in as does a ground mounted manual home TV antenna. The DirecTV technology does not allow the reception of their HDTV programming by any other style antenna so you could use a dome style antenna, add the SWM hardware and use the Genie but all of the programming will be in SD only.