As stated by Chuckster57, I think your only hope is to run your on board AC. It will get hot in that trailer while traveling baking in the sun. Here are other things I would recommend.
I would make sure both dogs have plenty of water
I would add at least two fans per cage to circulate air
I would purchase a remote thermometer that you can monitor from the truck
If possible would put them in an area where you can concentrate the cooled air
Key is to monitor temp near them and check water
The big guy is going to be bigger problem being cool
Ultimate RV for your situation is a TH with on board generator
Nice to have the furry kids with you on those camping trips
to The Forum From Western PA
Be Safe and Happy Camping
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