It is a dometic penguin II 15k btu with heat pump. That is the standard for airstream ACs that are mounted mid ship for trailers 25’ and up. The rear (second unit) would be a 13.5k btu unit.
You will need an Micro-Air EasyStart 364.
https://www.microair.net/products/ea...r-conditioners
You are smart to install one, I run 2 of them on my current trailer (one for each AC). There are penguin II specific installation instructions on their website.
Also, my $0.02. Change your order ASAP and get a second AC unit. A single 15k unit is not enough to cool that trailer with ducted air.
There are many threads here on that topic.
If you get your trailer and want to add a second AC after the fact it costs $11k and a trip back to the factory.
I don’t know why they don’t make the second AC unit standard on that length. One is not enough.