Sitting at home at the moment, in the process of deciding whether to take a run that sounds like a really bad idea. It has to be kept below 65 degrees, in my van, for a ten hour drive on one of the hottest nights we've had this year. The low for tonight is forecast to be 78 degrees.
I'm barely insulated (1/2" foam board insulation, such as it is) and only the standard front air conditioning aided by an oscillating fan that's mounted between the seats on my ceiling. Even given the greedy desire for the money this would pay, I'm having trouble imagining I'd be able to keep the temps down. Certainly trying to keep a twenty degree difference between inside the van and the outside air is laughable. For the record, right now my air conditioner is putting out between 50 and 60 degrees as measured at the dash vents.