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.
Interesting point. My short bakfiets would probably be unrideable at 25kph with more than a banana and me on board.
But if I ever have an excuse I will buy a 45km/h cargo.
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.