We use a number of options, depending on how long we will stay in a location.
We have the outside sun cover, but that's a little but of effort to put on. We have the circular reflective oval panels that can kinda twist and fold up. We have 2 sets and use them for overnights and cooling effects, if the cab is getting hot. Sometimes we only put them on the afternoon west side window and part of windshield, just to cool things down.
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Options work, ADAPT and overcome.