While I believe you could run 2 high efficiency AC's on 30A service - I agree you wouldn't be able to do much else without tripping the main... (microwave, coffee pot, blowdryer - even one of these will push you over.)
If ordering a new rig - the 50A upgrade is the way to go in my opinion... More than 3 times the available power for anything you want to do. And even outside of FL, TX, AZ in summer - even if you just need one - you always have a spare on board (I alternate between them when only needing one - usually running the one furthest from where we are sitting (using the ducts to spread air throughout) to reduce noise levels.)
In a current rig - bringing an extra 20A line in would be my preference to avoid the issue above. As you mentioned though - doesn't help with boondocking... Perhaps a switch to select the source for the 2nd AC - run it on the 30A when you have to (assuming high efficiency) - switch to the extra 20A when you can.
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Greg
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
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