Yes you can run two air conditions on 30 amps but not much else. Plug in a hair dryer or heat something in the microwave and the circuit breaker you are pulling power from will trip. Since she is visiting family I would suspect beyond the air conditioners the electrical load was minimal.
Using a cloths dryer or arc welder outlet without some type of adapter would have burned up (as in actual smoke coming out) everything 120VAC that was plugged in such as the microwave, power converter, TVs and such. Since she didn't call to say the coach was on fire someone must have done something right in the adaptor category.
I'd call this one a push. Can be done but not recommended and the dryer outlet, well you can give it a try but not with my coach.