As you've now experienced, your coffe pot will work fine. You have a 120VAC-30A rig. Plug into a 120VAC-30A pedestal. If a 120VAC-50A pedestal is all that is available, then simply purchase an adapter (male 50A/female 30A) and plug in as normal. In either case, anything that you would typically plug in at home will likely work fine plugged in in the RV. Just be aware that high draw items (A/C, microwave, hair dryer, etc) may require you to limit their use to only one or two at a time on your 30A RV.
(For those purists out there, yes, I understand that a 50A service is "technically" 240VAC; no need to jump in here. For the OP's purpose/question, that is completely irrelevant.)