Your unit will still have a thirty amp breaker in it's panel (distribution center). So hooking up to 50 won't allow you to use anymore power than hooking up to a properly functioning 30 amp source.
The key being properly functioning.
I was at a Thousand Trails campground in New Jersey and kept blowing the 30 Amp circuit with nothing running but the converter charging the battery for some LED lights and the A/C. I checked my draw (22 amps) and then reported the issue. While waiting for them to fix it I hooked into a 50amp with an adapter. The campground tech came. I use the term tech in the same way my father who was an elevator operator during his college years called himself a vertical circulation engineer. At any rate the tech said you should always hook up to 50 these campers draw too much power for 30 amps.
I know I shouldn't bother... but I tried to explain it to him. No luck.
Hooking up to 50 amp will give you 50 amps to the distribution panel in your camper. There you hit a 30amp breaker. As soon as you draw about 10% (varies depending on age of breaker) more than thirty or sustain even a slight overdraw and over heat the breaker it will trip. But if it's properly wired, and the breaker is in good condition, and all you leave on while your gone is a single A/C unit it will not draw anywhere near enough to trip it.
Until a power outage happens. If you get a power blink, the compressor in the A/C will not unload. So when the power comes back on a second later the motor will overdraw trying to restart the A/C. This may cause the A/C circuit or the camper circuit to trip. No more A/C until its manually reset.
A quality RV surge system will include a delay circuit so it will wait to restore power for 120 (varies) seconds so that the compressor unloads and you can safely send power back into the unit.
In PA we use a fantastic fan that's temp controlled so that if we lose the A/C while out the camper won't get hot enough to harm the pets. Our toy hauler has vents that we leave open to create the cross draw. But if parked in the blazing sun of texas in summer with pets and the nature of campground electrical... I would want a auto switchover generator.