The BEST internet service is a service you provide yourself such as your phone as a hotspot. T-Mobile and now a service called Millenicom reselling the T-Mobile service offers fairly large data plans with free streaming options for many services. Something like this might work for you. If you can get by without streaming TV and similar (getting satellite TV is a much less expensive option in many cases) then your phone as a hotspot or adding a MiFi device to your current plan might be all you need.
If, by some miracle, you come upon a campground with good wi-fi you can take advantage of that and cut the data plan back as needed.