PS I would never disconnect a passenger side airbag to accommodate a dog. A dog is perfectly happy on a back seat whereas your human passenger some day could die for lack of an airbag.
Most dogs that get carsick do so because they are looking out windows, moving about, and the motion makes them ill. Crating a dog is far more comfortable for many dogs because of this and if they are anxious throw a sheet over the crate. That is how I transport nervous rescues. It's also how I start to teach a dog to travel in a car -- because the crate tends to make them feel safer. If you ignore whining it eventually stops. If you respond to it it teaches the dog that whining is a rewarding activity and gets attention.