Board storage in hot vehicle - traveling to Italy

Hi,

I'm driving to Italy in a campervan and want to take my Carbon GT board but am concerned that high temperatures in the vehicle will be bad and potentially dangerous for the batteries. Can anyone reassure me, or provide some tips on how to keep it cool and safe?

A lot of owners will be from countries of similar heat to the Italian summer sun so how do you cope?

Thanks in advance,

Nick