Air Conditioning for Ute Canopy

I'm wondering if anyone has ever installed an air conditioner in a ute canopy, or have any ideas on ways I can make this work?

I have just bought a new Hilux and will be installing a canopy on the back for my 4 dogs to travel in. We frequently travel long distances (12-14hrs in a day) from Broken Hill to Sydney, and as our summers frequently reach 40-47 degrees, they will need some kind of cooling system. I feel like the rooftop systems seen on caravans will be too heavy for a fiberglass canopy.

(Im not after whirly birds or simple fans, I am interested in a proper air conditioning systems/units only. I plan to insulate the canopy to help keep the temperature stable.)

I have spoken to a few air conditioning 'specialists' (I use that term loosely) who just looked at me blanky and said they couldnt help me, so my current lines of enquiry are truck sleeper cab air conditioners (however most are too bulky) and talking to some hotrod people who have had entire air conditioning systems installed separately as they cant fit under the bonnet. I have no idea how to install one myself so will need a qualified person to supply and set it up/
I am considering the zerobreeze mark 2, but would rather not have to keep changing batteries that only last 3 hours

It must be able to run while driving, but ideally would also like it to be able to hook up to dual battery, solar and/or 240v power so that I can run it while parked and keep the canopy cool (at least for a short while) while camping.

I have never found anyone who has successfully AC'd a canopy, but surely I cant be the only person in Australia with the idea... Any ideas would be appreciated, or suggestions for reliable AC specialists in either Sydney, Mildura or Adelaide.

thanks for the help!