Trailer with 2 wheels is more stable when used as a utility hauler between tripps ..


and if you only have your gear in the trailer , it is possible to put it all in a bag with backpack straps
and in places where you have to get off the bike and cross things like road washouts, fallen trees, and climb stairs & such ..

a bike with panniers would be a struggle , but you can wear the trailer and carry the un-laiden bike much easier .


and it's easier to carry a big jug of water to refill your handy on bike drink bottle ..

FWIW tents with awnings over your bike and trailer get into the 10 pound range or so ..


Out here, BoB trailers towed by road bikes gets the job of traveling with your gear on your favorite bike done, fine..


myself I have 2 , 2 wheel trailers.. A Burly CoOp flatbed with 20" 406 QR wheels

and a folds flat Carry Freedom City, that tows, paired with my Brompton.. 12.5" wheels ..