Perfect! Glad we got that cleared up.
The Microwave and Ceramic Heaters run off of AC power and would function on shore power even if you did not have a converter. You would be limited to 30 amps max usage at one time, but that would be the only limiting factor.
If you add up the amp rating of all of your items and it is under 30 you should be OK. However, the draw of the microwave, 2 heaters and the convertor might draw a bit too much. Turning off the heaters when the microwave is in use should solve that problem.
As far as what convertor, I can only speak from my experience. I installed a PD 9245 convertor 5 years ago and have been very pleased with it's operation. It was one of the best upgrades I have done on my 75 Trade Wind. No more hummmmmm and no concerns about cooking the battery. There are several other converters available that others have installed with the same results as well.
Wally Byam Airstream Club 7513