OP, you need to decrease the width of your picture to 600.
Normally I'd recommend that you replace the roof vent with a solar powered one BUT not on one that looks that nice. You need to increase the airflow over the coils on the rear. On my 31' there is too big a gap between the coils and the inside wall BUT I'm not in an area that HOT so mine works OK. If there is more than a 1" gap to the wall, a baffle needs to be added Plus 12V computer fans need to be added at the top and bottom to increase the air flow. You could power it with something like
this mounted on your roof behind the vent and out of site.
The freezer sections needs to be close to 0 before the refer section will get cold enough.I would find the Dometic installation instructions which will have info on how big a gap and if it's more than that, I'd make Airstream install your refer properly. I think you will find a big gap at the bottom, getting a little better at the top of the coils.
