First off, I hope you understand you are not going to get 30 amps out of a 2000 watt generator. At most, you can get 16-2/3 amps, and that only for a couple seconds if this generator is labeled like others, with the surge capacity in big letters and a smaller continuous capacity in smaller letters. Most likely this one is 2,000 watts surge, 1600 watts continuous, or maybe 1800 watts continuous. Either way, if you put too much load on any generator it will either kick itself offline or shut down. It sounds like this one shuts down.
So, what did you try to run? Besides "a few lights," I'm sure you also had the RV's converter trying to charge the battery, maybe 500 watts right there. A dozen lights at 18 watts each, that's another 300 watts or so. It all adds up, my friend.