Welcome to the forum and congratulations on the new trailer.
Lots of people struggle with those options and we did too. We opted for 'No' for both. You can search the JOF and see what others have said.
The 50amp option seemed expensive and we didn't have any real reason that we'd need it, even though 30amps is not very much.
The 13,500 btu AC should suit us fine for our plans to travel in the north in the summer or to higher elevations. We did hedge our bets and opted for the insulation package, however.
We also plan to boondock a lot eventually and may have to rely on a generator. The 13,500 AC will not need as much generator power as a 15,000.
Also, there are only two of us (maybe an occasional grandson) so our power and AC needs should be less than a larger family might need.