A true 50A gen to run both ACs are big and heavy, as mentioned. Most people will use a combination of two smaller ones and a parallel kit. I would recommend two 4500 watt. I really like my Westinghouse 4500. Amazon has them for around $1000 each and the parallel kit. Very quiet and has remote start and only about 100 lbs so easier to put into the bed of the truck or on a rack in the back of the RV. Mine will run one AC and the microwave at the same time and only be at 75% capacity.
To be honest, with 85 degrees, you should be able to get by with running one AC to maintain the temp after overnight cool downs. I would try that before I went out and spent the money on two.
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