Here is an idea for you all that I have been doing for many years and I want to share my idea with you.
If you want to stay cool (sort of) over night in the cab, but dont want to leave your windows open to much, because of your security within the cab, I suggest that you buy a couple of these for your windows.
Here is a link to the product but it can be bought cheaper if you look around.
2 X PETGEAR TRAVEL REAR CAR WINDOW DOG PET ANIMAL UNIVERSAL VENT MESH GUARD amazon.co.uk/dp/B01GU2HH1Q/ … oDbDRAZ63N
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