The 50 amp is 6000 watts per leg for a total of 12000 watts.
There are several paths to follow to be able to run both air conditioners at the same time.
If you want the lightest weight solution, then you would have to have a 24 volt battery bank, mated to a 4000 watt hybrid inverter, powered by a 3500 watt Champion inverter generator. Dry weight under 100 lbs. A dc to dc converter would provide for the 12 volt needs for the RV. This may be the most expensive route.
Next lightest weight would be the Yamaha 4500 watt inverter generator. The dry weight is 194 lbs.
The Honda 6500 is 260 lbs dry weight.