I have the 390 AH option and have run my trailer for four days without additional power. It was cloudy and rainy. We used the microwave, coffee pot morning and night, and had the tv on for several hours. By the end of the four days, the batteries were down to 30%, if I remember correctly.
In the hottest temps of Texas summer, I have run my Truma AC off of the batteries and I believe it ran for 3 hours before I shut it off and the batteries were about 50%. I would have to do that test again to verify because I wasn't paying too much attention to the details.
I also opted not to get the Platinum primarily because it was somewhere around $15000. That is some crazy money for something that can be done much cheaper DIY. I got the pro for the 3000 watt inverter and the 390s work for me until we need new batteries then I will definitely upgrade to 600+.