First, the answer to your question, NO, there is no simple way to test how an MSW inverter will work with your equipment. As usual, there is no middle ground here. Many came on and said you can't use them with just about everything from TV's to heating blankets.
I have to agree with "travelnutz", maybe just not how he presented his response. Many coaches, especially your large DP's have had inverters as standard equipment for over 10 years. It's just been in the past few years, with the addition of residential refers and reductions in price, that PSW inverters are now being used as standard equipment.
The MSW units for the last ten years have worked well with just about everything you can plug into them. The only thing that routinely had issues were heating blankets. The only other item that I believe is often damaged by inverters are microwaves and that's mainly because of the amount of power they draw. I don't run my microwave on either MSW or PSW. If I owned a very high end unit with large battery banks and multiple large inverters, I might use a microwave then.
With all that said, if you're buying $100.00 inverters or something from Harbor Freight, you certainly might have issues, but when it comes to RV's with large quality inverters, like Xantrex or Magnum, you should be fine running almost everything you have.