What kind of gen should I shop for?

thats going to be a tough one, are you putting soft starts on the AC units?  if so you could get buy with a smaller genny, I am actual concidering getting one for the 5th wheel.  not for actual camping but rather for running the AC during exceptional heat waves.  SO I am looking like you, but I only need to run one AC if it comes to that, so I can get buy with something smaller.  I also want ultra quiet, which is why I won't even concider a built in one, but it has to be light enough for me to move around.  I think this will be your biggest hurdle in one that can run 2 AC's at once..  can you move it around, if not you might as well go with a built in and save your back.  

the first thing to do would be to hook a meter up and start up your ac's one at a time and see how much the current spikes with one then adding the second one.  the spike and the running current.  then at least you'll know what range you looking at, do you even need to run two AC's at once.. can you run the one in the living area only and the one in the bedroom at night only?  This would reduce your requirments quite a bit.  .  myself I am thinking of getting THIS ONE .  its on sale at costco for 699 CDN and only weighs 57 lbs and can run at 62db so faily quiet, I would rather be down in the low 50's high 40's like the honda and several others, but I'll see what I can find thats afordable.