I have Dishnetwork at home, and bought a tripod from camping world and a Direct TV dual LNB Dish, yes, I use it for Dishnetwork. We take two receivers on the road, one for kids bunkroom and one for us. Works out great, but I only try to hit 119, it has most of the stations I want, and it's alot easier to point and hit 119 than try to get 119 and 110. Would be okay if your gonna stop for a weeks or so, but most of our stops are two or 3 days. My Brother in law just got Dish and takes a Dish 500 with them and they love it, but only use it for long stays. As far as direct TV having better stuff, most of Dish's stuff thats been out for a while is pretty decent, the 311's are a very nice receiver.
You could also request a dual tuner DVR or go with a DVR and a single receiver, that way you can record on the road.
He also had cable internet but after switch to Dish, went with DSL as they had local access number to call with laptop while on the road.