These shortcodes work with self standing plugin working version 3.0.22

[carrental_category id="5"] - list cars from category ID 5; if you want to mix multiple categories, the correct format is: [carrental_category id=2,3]
[carrental_cars] - list all cars (like our-cars)
[carrental_manage_booking] - show manage booking form
[carrental_locations] - list all locations
[carrental_fleet id="1"] - box with fleet id = 1
[carrental_book_box width="400"] - include booking form with width of 400px
[carrental_currency_selector] - include currency selector (this shortcode is not in the regular theme)

from version 3.0.3, you can add the language selector; this will switch language on the whole site. Example shortcode:

[carrental_cars lng="en"]

All shortcodes support language selector except for [carrental_currency_selector]

If there are more parameters in a short code (such as box width and language), you can insert them in any order:

Example: [carrental_fleet id="1" lng="en"] or [carrental_fleet lng="en" id="1"]