And yeah, i am aware that 2 seated vehicles, don't have windows/doors on the back.
First when you are in the vehicle and you enter into "Vehicle settings/options", it shows you list of options:

First three options work fine, now when you select option 4 (Open/close Doors) it says "You can only control the doors of the last vehicle you entered, from outside the vehicle.".
Once you are outside, you can't select "Vehicle options/settings" in the menu at all. Anyways, i figured out you can use command /door for doors, it will open this menu:

Whatever option you click in that menu, it will show you this message "Use /door to open/close individual doors quickly. User '/doors open' or '/doors close' to open/close all doors."
If you use /doors open, it will open all doors, and when you do /door, in the menu it will show state as "Closed"
If you use /doors close, it will close all the doors, and when you do /door, in the menu it will show state as "Open"
When you select option 4 in the menu, "Open/close Windows", it will show list of options like this:

If you click on "Open all" it doesn't work at all, if you click on "Close all" it works.
If you select first two options, it works.
If you select only option three, it will show state of all as "Open".
If you select option one, and then select option "Open all", it will show state of all as "Closed"
Also 2 seat vehicles, shouldn't have option for "Back Left Passenger" like they don't have option for "Back Right Passenger" on both of the menus.
This is 2 seat vehicle menu:

This is 4 seat vehicle menu:


