Motion Sickness in Dogs?

I have an American Eskimo who is almost two years old and he gets severe motion sickness almost instantly on any travel. We are getting ready to move 980 miles away and will be driving we have traveled a lot with him the last ride was 8 hours long and he was ill for 3 days after wards, we have tried ginger, Dramamine, small trips, just sitting in the car etc. None of these work he constantly vomits and eventually gets diarrhea. We have tried treatments up to 3 days prior and taking his food and water away. Is there anything a vet can give us to help make this trip easier on him, we do frequently walk him every 1 to 2 hours while traveling, I think basically he will need to be sedated and something for nausea in order to keep him from getting so sick, I am worried that he will become severely dehydrated if I do not do something else for him. Within less than a block this dog is vomiting when traveling and like I said before he will vomit for a few days after travel. He does get very anxious around other people he is the type that gets very excited around other people. I hope someone can help me as he is a big part of our family but unless there is help I do not think he can make the trip safely. We do plan on trying to make it a two day trip with a stay overnight at a motel for rest. However, I do not want to see this poor dog suffer like he does, then the next problem will be actually getting him to the vet in order to get the medications. The last time we took him in for his shots they were unable to give them to him because he was so sick, and we only live 2 miles from the vets office. Any advice would be greatly appreciated.