OP, since you have a DISH Winegard Travler, essentially the sky's the limit in terms of what you can install in your RV. By this I mean, whatever DISH equipment you install in your house, you can install in your RV.
First, you should have no problem using two Wallys in your Newmar since they apparently ran two coax connections into your RV from the Travler. This means that you can watch whatever channels you want on each Wally.
However, Wallys are at the bottom of the DISH satellite food chain -- they're only 1-tuner receivers and if you want to record on them by adding a hard drive, it's going to be limited. While many folks swear by their Wally (or 211), it's usually because a Wally is their only option because they don't have a Travler.
I don't know what you plan to install in your house, but I would hope it would be a 16-tuner Hopper 3 unless you don't watch much TV.
If you do install a Hopper 3, then you could use it in your Newmar when you go camping . . . with some mods. The first would be running a 3rd coax into your RV from your Travler (since Newmar didn't), but new RV owners are usually hesitant above doing stuff like this.
