Is your trunk tank insulated?
During daily driving the additional capacity of fuild helps a little bit, but you have to remember after a couple of pulls the water in the system will heat up and will be only cooled to the point of what the front mount heat exchanger can cool it.
If you do 10 to 15 back to back pulls with a rear tank on a hot day without ice YES the SC will shut down.
I dont think insulating the tank is going to help.
I run a three gallons tank and stuff with ice, by the end of the 1/4 mile run the ice completely melted. This is on a 50 degree day.
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