Spare gas canisters in a hot car

Probably there's a very obvious answer that I haven't thought of yet. But what do people do with their spare gas canisters and food when on multiple multi-day walks?
Many places the car has to be parked in the sun at least some of the day. Ice in the esky will only last a couple of days. Temperature inside the esky, even under other insulation, gets hot after a few days. Temperature in the car can get past the 50 degrees C recommended for storing gas canisters. Plus I'm not that keen on my dehyd meat and chicken cooking in the car so to speak.
Wondering what other people do (apart from using metho
)?
Many places the car has to be parked in the sun at least some of the day. Ice in the esky will only last a couple of days. Temperature inside the esky, even under other insulation, gets hot after a few days. Temperature in the car can get past the 50 degrees C recommended for storing gas canisters. Plus I'm not that keen on my dehyd meat and chicken cooking in the car so to speak.
Wondering what other people do (apart from using metho
