trunk, yeah. but if it is well and truly in the shade the whole time (eg, interior of a parking ramp) even the cabin shouldn't get any hotter. any direct sun into the cabin is your killer here
and if 85 is the max, the average will be lower, and better (assuming in this case it's not too enclosed--open sided parking structure)
85 is cooler than body temp.
my concern would be theft tbh
A private Mastodon instance