I recently went the same route and added a boy (Brando - also a retired show dog) as playmate to Ruby. If it goes anything like it has gone at my house, you are in for a blast and so is Ziggy.
Everyday between 5 and 6am the Basenji alarm clock named Zoe goes off. Some mornings she has a squeaky yawn and then looks surprised when the noise come out.
I'm afraid If I do decide to get another I won't have a chance to introduce them beforehand as it Will probably be a puppy I bring from the US.. I doubt there will be a problem since she will be a young puppy…
I think a nice long walk does help with car anxiety. It allows them the time to "do their thing: and everyone knows an exercised B is a calmer B….the only other article I once read offered advice on giving a small bit of ice cream to settle their belly. Most dogs do not do well with ice cream but they do make ice cream for dogs (Frosty Paws) and you could try that I suppose. Perhaps if the car ride was associated with "good times" it might lessen the anxiety a little. Like any species, if your B really has motion sickeness all you can do is to try and be alert to it and maintain hydration. It's good you are aware and I'm sure you will take care. My best to you and your Chance. M