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I actually did a test a month ago that's pretty close to what you're asking. I put a 5000 watt 240 heater on my 803a 20-21 Amps) which is the equivalent to a 3.5 ton AC. Then I turned on my 3 ton AC (15.2A power draw 77A inrush). Ohh also it was running the rest of the house of course. My LED...

As long as they both don't start at EXACTLY the same time inrush shouldn't be a problem. Mine will start the AC just fine even if its already at 40% load.

I also needed those for the blower motor amp draw, which in your case is 2.5 amps each. Problem is I can't quite tell if the motor is 240v or 120v. For now let's assume the worst and it's 2.5a at 240v times 2 units - that's 1200 watts for your indoor blower motors. We are up to 33.45A or 8,028...

So your AC's total running power draw is 28.45 Amps, or 6,828 watts. That's roughly 54.7% of the output of an 803a. If possible could you get pictures of your water heater and furnace data plates? You'll probably have 2 furnaces if you have 2 AC's.

Taking pictures of your big electric consumer nameplates and posting them would allow us to help you the most. But an 803a should be able to handle your whole house, unless you have a tankless hot water heater. (Those things can be monsters) Electric strip heat would also be pretty brutal.