I drive a Mazda 3, and I can fit an 8" tube in the trunk, but not a 10" one. If I go like that, the base can sit on the back seat, and so I have myself, then an empty front seat, and then the middle seat plus one of the side seats in the back.
The question for you is what you will be able to fit in the trunk. If a full size 8" tube fits, you're probably not going to find any extra seat space by going to the collapsible.
The base is probably not going to fit in your trunk. Take a measuring tape out there and you can see what the space looks like. Regardless of which one you get, the base is probably going to have to ride in the passenger compartment with you. Maybe I'm wrong though.
The 9mm eyepiece is nothing special, just a low-quality plossl. Enough to get started on, but you'll start running into its limitations pretty quickly. People around here like the 6mm gold line for planets for those telescopes, and I agree with that. Look up "6mm gold line" on this sub. You could try something like the Meade 5.5mm ultra wide as an alternative to the gold line. Amazon sometimes has it for under $100.
https://www.amazon.com/Meade-Instruments-1-25-Inch-5-5-Millimeter-Eyepiece/dp/B005OD17U0
It's rather big and cumbersome, you've been warned.
I'd recommend some ScopeTotes: http://astronomy-shoppe.com/?page_id=177
Meade 5.5mm, 14mm, 8.8mm, and 20mm UWAs (in that order of priority): https://www.amazon.com/Meade-Instruments-1-25-Inch-5-5-Millimeter-Eyepiece/dp/B005OD17U0
An observing chair of some kind
And SkySafari.
I have heard good things about BST Starguiders being superb value for money, but I've not used them myself. Here's the 8mm one: https://www.firstlightoptics.com/bst-starguider-eyepieces/bst-starguider-60-8mm-ed-eyepiece.html There's lots of other focal lengths available too.
If you are willing to spend a bit more then Meade Series 5000 UWA 82 degree eyepieces are very good and still not super expensive. I recently got a set of them and they are really good, much better than the standard ones or goldline eyepieces. But they do cost more. For planetary I would recommend the 5.5mm: https://www.amazon.com/Meade-Instruments-1-25-Inch-5-5-Millimeter-Eyepiece/dp/B005OD17U0?th=1
There are also 8.8mm, 14mm and 20mm focal length variants. If you wanted one eyepiece for planetary and one for DSO I would probably go for the 5.5mm and either 14mm or 20mm one. The 20mm is sweet, but very heavy and requires a 2'' adapter. And it's more expensive. All of the others are 1.25'' eyepieces. So switching between the 20mm and others is a bit more cumbersome than switching between the 5.5mm, 8.8mm and 14mm.
Oh, and as a bonus, the Meades were delivered from USA to Estonia in 2 days. Amazon delivery was on point.
I've heard a lot of good things about the Meade Series 5000 82 deg eyepieces.
They're also very cheap compared to the ES 82, even compared to when they were on sale last month.