Hello Luke,
I cant offer any words of wisdom about the performance of the air conditioner, but have you fully considered the possible alternatives?
The permanently fitted units tend to be quite heavy, and swallow up paylaod capacity.
They tend to be quite expensive,
They can only be used in the caravan.
One of the alternatives might be to consider one of the mobile units available for DIY stores. These can be set up to vent the condenser air to the outside.
They may be just as heavy but you can use them at home, and they will tend to be cheaper to buy.
As for performance, that depend a lot on personal preferences, and how you set them up.
Incidentally whilst ownership of the AC hopefully wont be 'Traumatic', the manufacture is TRUMA