I would like to recommend shade cloth as opposed to a tarp. A tarp will retain heat and shade cloth offers a ten degree drop (measured not estimated) and allows a breeze to get through and heat to rise out.
Having hauled Jäger around in the bed of a truck (an orange Chevy) for a couple of years I'd encourage you to remember starting, stopping, and cornering can send the dog flying around in the crate. When riding in my bride's SUV and now next to me in the Jeep (a 59 CJ5) I announced "Brakes" (Bremse) and he has learned to brace himself. I don't know if you want to put a buzzer in the bed so you can warn the dog to avoid getting slammed around. Then again we're driving around the Phoenix metro area and it's noted for aggressive drivers that you may not need to worry about this.
Before Jäger became my service dog I put a thermometer in his crate and a note listing the time he was was left, the temp, and if he drank. This came back to help me more than once. I've come out of a range to find a crowd of people discussing how abused and thirsty Jäger was. I joined in vilifying the dog's owner until someone started dialing the police to come rescue the poor dog. Then I "Noticed" the time sheet and that there was a record of his being checked on every twenty minutes. And then pointed out that I was the dog's owner and they were not put here by God to judge. I know this sounds like a bit of overkill but I've had idiots run up and throw water on Jäger's feet because he looked hot and had people pull up beside me at lights and while driving and inform me my dog was about to die of thirst while we were still in sight of our house.
The point to the drama is, as my vet pointed out, even when she identifies herself as a doctor of vet med do gooders still know better and assign themselves moral superiority and when the cops show up anything you say is just an excuse.
Sorry about the rant it's summer and I have to deal with idiots too frequently. I apologize for hijacking the thread about your excellent canid transportation system.
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