Less is more! We prefer panniers over a trailer.
Yes, you can pack sloppily and take more in a trailer. That's not necessarily a good thing. One or more additional wheels to look after. Lots more length to maneuver. Our experience with trailers is they change handling and braking dynamics, forcing a much more conservative approach to downhill runs and planning stops.
We suffered trailer damage during a day trip that forced us to abandon the rest of the trip. The damage was result of the trailer striking an obstacle and torquing and bending the tow bar (the part connecting the trailer to the bicycle), rendering the trailer untowable. An inconvenience on a day trip that would have been more problematic on a multi-day trip.
However, a cargo trailer was something of a godsend on a multi-day trip on the Great Allegheny Passage trail with a large all-ages group. We could offload gear off riders that were struggling. Everyday the trailer started out almost empty and by the end of the day it had a large collection of stuff.
Good luck with whatever approach you choose.