
Midea
Duo Series
Cools large spaces well, but fragile window tabs.

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I am really happy with my midea dual tube portable ac. 12K btu
The first rule of portable air conditioners is get a 2 hose model (or the Midea with the giant oval hose that is really 2 hoses. 1 hose hose models are an america only thing. They blow out the very air you are trying to cool. The only reason they exist is 'stupid people are confused by 2 hoses'. 2 hoses balance the pressure and use outside air to cool the condenser. They are the correct choice.
10000% go with the midea, I swear by it and have two of them. You save noticeable amount of energy with the inverter, pays for itself quickly compared to the $200 ones.
The best all-around RV portable AC is the Midea Duo. It’s efficient, quiet, and cools small RVs fast.
I got a dual hose Midea portable AC from Canadian tire two years ago. It’s a damn beast and cools my entire living room / kitchen. They are pricey, I got mine on sale but that’s my recommendation.
Hey, you should get one that pulls in air from outside, a dual ported unit (both pulls in air from and exhaust air to the outside). Because, if you use this and you're exhausting air.... It is basically sucking air out of the van, creating negative pressure. So the van needs air, so the negative pressure pulls air from around the window or wherever air can enter. So warm humid outside air will be pulled in. Midea makes a dual ducted unit, that will work better. You can do all the math you want on the unit you mention but this is self defeating, the math is worthless on single duct portable AC's.
You can run a portable like the one you shared but it's not going to work as well as you think. You need an air conditioner that both pulls air from and exhaust air to the outside. That unit you're looking at only expels hot air outside. Which means you're going to be sucking in air through all the crevices in the vehicle, around the doors and windows and wherever else while you're also trying to cool down inside. Midea makes one that is more what you should use if you insist on the portable AC.

Midea
Duo Series
Cools large spaces well, but fragile window tabs.

Midea
4-in-1 PortaSplit 3.5 kW Portable Air Conditioner and Dehumidifier
Energy-efficient split system, but bulky with frequent drainage.

Midea
PortaSplit 8K
Powerful split system, easy setup, but needs frequent draining.

Danby
14,000 BTU (12,000 SACC) 3-in-1 Portable Air Conditioner with Inverter - Dual hose / Remote / Wi-Fi (DPA120CBIMBDB, DPA120CBIMBDB-RF)
Very durable, long-lasting, smart Wi-Fi control.

Whynter
ARC-1230WN
Efficient, dual-hose, no water draining, with Wi-Fi.

Ranked #1
Midea - Duo Series

Ranked #1
Midea - Duo Series

Ranked #1
EcoFlow - WAVE 2 Portable Air Conditioner