You could get something like this and leave the hatch open with A/C
https://www.campingworld.com/napier-sportz-suv-tent-model-82000-56490.html?utm_source=google&utm_medium=ppc&utm_campaign=%7bCampaign%7d&gclid=EAIaIQobChMIvaTwpfLQ-AIVyhXUAR1tqwoZEAQYECABEgL42PD_BwE&gclsrc=aw.ds