I current have a VIP 722 K receiver with Sling device attached. It has been working fine but occasionally locks up when I have the OTA module plugged in. I removed the module. I also have a 512 receiver in my travel trailer which works well. I inquired from Dish about upgrading to a Hopper receiver and they said that I would have to change the RV receiver to a Wally as the Hopper upgrade was a different system. Since both receivers are separate why would I have to upgrade the RV system?