Animals won't eat if they are anxious, upset or fearful, so this is why your dog ignores his Kong in the car.
You need to start over with him, and not take him for any 1 hr rides for now.
Take him to the car, and use happy tones "Let's go!!" When you are both in the car (do not turn the engine on) and he starts whining, clap your hands and say "QUIET!!" If he stops for even 3 seconds, praise him and get out of the car.
This could take quite some time to get him over his anxiety, but one step at a time should do it.
When he learns to be quiet and relaxed in the parked car, then start the engine - if there is whining, "QUIET!!" and then engine off and out of the car.
Hopefully, the periods of silence after you say Quiet should increase, until you are able to drive half a block or so.
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