While not directly answering your question, I would highlight the point about leaving rqts in cars. In short, don't. Your explanation of the heat of the day could cause damage to the strings and/or frame.
Babolat Strike 18 x 20; Wimbledon stringing team since '04 - Head Wimbledon stringer '14; Babolat stringing team '10-'14. Twitter - @therqtstringer