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Mostly the convenience of having all-in-one, i.e. not having to hitch anything up, being able to just throw everything on, only one thing to store and lock up...
One limitation of the Bob Yak trailer which I came across, compared to using a nippier cargo bike like an Omnium, is the maximum speed rating:
"SPEED LIMIT: 25 mph (40 kph) A bike with trailer attached, steers and feels different. Ride cautiously. Speed wobbles (and loss of control) can occur if speed limit is exceeded."
From the Bob Yak/Ibex Owner's Manual.
Mostly the convenience of having all-in-one, i.e. not having to hitch anything up, being able to just throw everything on, only one thing to store and lock up, being able to do a cool build thread on here, ability to complain about lack of tyre clearance, what mid drive to use etc.
I'm about to run out of space on my drop-front. First camping trip with my boy coming up and it's going to need the trailer as well as the box unless we really take the bare minimum. Stick a second child on board and I'm going to be well into the panniers and rear rack territory too!