not sure I understand...
what year/make/model is your RV?
what do you mean by '20amp'? The power you are plugging INTO? or the size of your RV's capability?
[20amp outlets can power anything in your RV, one at a time, anyway - as nothing will be using more than 20amp on it's own... even a roof air conditioner is only powered thru a 20amp breaker.... the breaker TRIPS, though, when you try to power too many things at the same time - no TV or cooking pot or even a space heater is going to need more than 20amps of power, but managing 'when' these things are all running at the same time is the trick - we ALL have to be concerned with these things, even those of us with 50amp coaches]
When you say 'bump up to 30amp or 50amp'... are you referring to the incoming power, or your RV's Main Panel capability?
'Where' are you plugged in? A house? An rv park? a generator?
'14 Palazzo 33.3 bunkhouse 34' diesel
KingTailgater2 Dish HD, 100w/5a SOLAR, BlueOx
100,000+mi since '14 - US, Alaska, Canada.... formerly Georgia, then NorthCarolina, now Alabama : )