If you have a inverter/converter such as my Magnum Energy one it may have a couple of pass through 120v circuits. If those fuses you are trying to remove have a white plastic end and say 15 on the end they are not fuses they are circuit breakers and they push in to reset. There could also be another one that says 30 on it and it would be the input power circuit breaker. If one of the 15's popped it will kill one of the 120v circuits in your rig. If the 30 is popped the inverter/converter won't work at all. If all of your 120v circuits work they are not likely the problem.
If you cannot identify the unit call the manufacturer of the RV with its serial number and they should be able to tell you what it is.
Jim