I have a trailer and a hamax rear mount seat.
We switch dependant on weather, speed needed, other equipment required etc.
The trailer is awesome - it takes a little getting used to at first but can carry either one or two kids and luggage (e.g. swimming kit). I have no qualms riding it on the road with children in it. It is visible and they could as easily get hurt in so many other ways.
The big plus about the trailer is they stay dry if it rains. As they aren't genreating heat (peddalling) it can be a cold spot on the back of the bike in the winter, in the wet, at 15mph, with wet hiar from swimming.
I would have preferred a Co-Pilot Limo but the Hamax was offered to me for £15. The Hamax is a bit bouncy and on bumpy trails my daughter isn't keen on it - but it is fine on roads. She has ridden in a Co-Pilot and as they are rack mounted they don't bounce.
I can use both the seat and the trailer at the same time so I could manage three kids. I wondered about a tag-a-long in the middle but think I would want to change the pull bike to a tandem for extra power.
I know someone with a thorn childback who has one pedalling, one on a car seat and then tows a trailer too....
this is what they travel with....
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