I have a 14 year old rescue dog that I trained to be a working dog and served our country over in the Middle East. I will be totally honest with you, my life is extremely difficult with a very dependent dog. I am a 100% parent, however, it takes volumes of time. Currently my dog is almost totally blind and almost totally deaf. The blindness has her sleep-wake cycle off. She will have me up 3-4 times/night. In the winter, this really allows the cold to come into the vehicle. Here are my tips to you that work for me:
1. I find pet carriers take up too much space with the "lip" they have around them and the door that must open. I use a stacking storage tote as a dog bed. I do have an extra large, airline approved, storage crate that I keep and travel with at my job site. When I am at work and not directly playing with her, she is in this. I do extra things for my boss in exchange for them tolerating my dog at work.
2. I tried many layouts in my vehicle, but my dog needs touch since she wakes up and cannot hear and see me. So, her bed must be near me.
3. She brings in lots of dirt on her paws especially in the rain. The tote is necessary to catch that dirt so it is not everywhere. I believe her sleeping in the bed would just make me volumes of laundry. However, I do keep an un-inflated air mattress on the bed. This plastic/vinyl layer is good to catch the dirt and for easy clean up when she is out of the bed.
4. She doesn't need big walks since she is old and tires easily. I tie her out to my vehicle when I am not directly playing with her and taking care of my daily chores. I go to places like Walmart that tolerate this until she dies.
5. I keep a consistent routine of the storage tote, tie out, and free play time off a leash in a safe, no traffic area, so she gets used to the routine.
6. I have a small bell that I put on her collar so I can hear her if she gets separated from me in the dark while on a walk. No use calling her, she can't hear me.
7. She gets thirsty more frequently. I keep a Tupperware container of water in her storage tote for those midnight sips of water.
I hope this helps.