If you need 50 amps to run two air conditioners simultaneously, you probably are not a good candidate for boondocking. From a practical standpoint, I would concentrate on campgrounds with 50 amp hookups.
Alternately, you might consider camping where it's cooler (due to climate, season or altitude), where no air conditioning is needed. Or, if you can get by with the cooling power of only one unit, the usual generator setups will suffice.
Personally, I don't ever recall an AirForums discussion thread on 50 amp generators...