> The trunk always seemed a more secure place to me, and on hot, sunny > summer days, it wouldn't likely get as hot as the passenger compartment.
That's what's involved in my own personal strategy. The trunk of my white car takes a lot longer to heat up in the summer sun than does the trunk of my wife's navy blue car (or the interior of either car). While I don't routinely keep photo gear in the trunk (other than a monopod and a tripod), I don't worry so much about using my "reflective trunk" for carrying or storing photo gear in, as long as it's not for too long a period or on the most "summery" of days. Fred