To determine the power draw, all you do is add up the amps. Normally on a 50 amp RV the load is split or balanced between the two 50 amp legs. The A/C's are on different legs and a microwave would be on one leg with an A/C.
If you are plugging these into the RV, you need to determine which leg the plugs are on so that you do not overload one leg.
You may want to run a separate cord to the pedestal to power one of the units.
You may not be allowed to set one of your units outside. Many parks will not allow you to set appliances outside,
Ken