The Trav'ler is required to receive the DirecTV HDTV programming and it would need to firmly mounted to a roof with about 3' of clearance around the entire mount. If you are a Dish customer you could install the Winegard Mission and get HD or you could install the Mission (or the Roadtrip Dura-Sat built specifically for the rigors of a truckers) and receive all of the DirecTV programming but without the HD programming.
The Trav'ler is not portable and the ladder rack is not an option. It's pretty big and weighs about 40 pounds.