Having a roomy car is a luxury for me. Aside from a big Dodge pick-up truck, my cars have been four-door sedans. Fine for a family, but a bit tricky with big birds in big carriers.
The new car is just so nice. I can pack birds and kids and still have room for more.
Empty car:

The cargo area has this neat cargo cover, so if you don't want everyone to see what you are carrying, you can cover it up!
And a very useful net to either tie down big stuff, or to help your groceries stay where you want them:

And a car full of birds and paraphernalia:

The back seat is empty, so I could still have three kids in there. Or two normal-sized adults.
Or three malnourished adults....
I have a long program tomorrow and I will be bringing perches and all the indoor stuff I need for a presentation. Gone are the days when I have to drive a car around that looks like this:

Hard to take a deep breath when you are up to your armpits in birds, a box of dead things, a poop tarp, a cart, perches, a purse......
Yippee! Susan can breathe again!