Re: Moving bees across country
I don't see that moving them would be a problem, on or in a truck, not a small trailer, too much bouncing. Screened top and bottom board protected from the wind. Pollinators move thousands, millions, of hives across the county all the time just netted and leaving the entrance open. Now the work and hassle involved might make it cost ineffective.
"bees better suited to the cooler temps.", I wouldn't worry about that.
All of my opinions and suggestions are based on my five decades of actual beekeeping,
not so much on book learning, watching YouTube videos nor reading internet sites.