The Solo Node is $17.50 on Amazon. Then getting the second line into the coach. Some/most with the Traveler Dish probably already have that but it may be run to a different location.
She told me the Solo Node with one Hopper and no Joey (or a wireless Joey) will give you three tuners. The Solo Node with one Hopper and a Super Joey (wired) will give you the full capability like at home.
The main problem remaining is getting locals. Dish will switch upon request (did it on our last trip) but it is not real reliable. Took four calls one day and then three calls to get them back to our local market when we got back home.
Seems like a lot of trouble for the NFL, NASCAR and the wife's movies but I guess it's all part of roughing it