If you were connected to campground power, then the converter "should have been" powering your lights (and the battery was not being used). So, if the lights dimmed/brightened, it's probably a "situation" with the converter.
If, however, you were on "battery power" (not connected to shore power) then you were powering your lights with the battery and any "dimming/brightening" would have been a result of either a corroded battery (or other wiring) connection, a change in power load (starting a fan, furnace, etc) that caused the dimming or possibly a bad cell in the battery that simply couldn't sustain the load without dropping voltage.
More information about how you were "using" your camper, what was connected to the battery and how your camper was "connected" to external power would help give you a better "best guess" as to what happened.
As a consideration, yes, if your battery is 5 years old, there's a very good chance that it is not performing at its peak, but I wouldn't suggest that it's "got to be bad" just because of age.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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