My wife and I started out in a 34' TT bunk house with 2 slides. The one ac did there with only the 30 amp service.
We upgraded to our 40' fifth wheel and have the dual a/c's with the 50amp service. The dual a/c's make a huge difference when your at a site and there is no shade near you. We stayed in Pennsylvania ATV park for 2.5 weeks and not a tree near us. Granted most of the day we were out of the trailer but when we were in, it was great.
When we go visit the in-laws we do use the adapters down to a 20 amp outlet but we can only run one a/c (obviously) and our lights. Putting the awning out goes very very slow even with everything else off. We run the fridge and HW on gas while we stay there. As long as a/c isn't on we can use the microwave and anything else.
At our home we have the 50 amp service installed where we park our RV. This way if we have guests they basically have their own little place to stay. We also have water lines and waste lines ran to it as well. We hide everything in the ground so it looks nice and neat.
One thing we miss about the 30 amp is the size of the cable so much easier to handle than the 50amp.