a 12V air conditioner for van with large cooling capacity will definitely cost too much energy, therefore an auxiliary battery will be needed if you buy a 12V system.
Maybe you could have a look at this one?
https://www.guchen.com/mini-bus-van-...s-ac-unit.html
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BTW, do contact the sales to confirm the following information:
1. its cooling capacity
2. its exact application, for what kind of vans?
3. whether the heating function is available?
4. its energy comsumption
5. a littble bit info. on its compressor.