Which bike for tagalong / chariot towing?

I'ld be grateful for people's thoughts about which bike to use to tow which child!
Is it safe to pull either a chariot or a tagalong with a carbon frame? I mean safe from the bike's perspective, not the child's. If so, which do you think is more suited to carbon?
I'm going to Doussard (Lake Annecy) for a couple of weeks in June, with our 4 year old and 1 year old. Intend to use the fairly flat cycle path to travel up and down the side of the lake with the family, but also intend to head up the hills on my own for some early morning exercise. We've only got space on the roof for two bikes (plus roofbox). I've got a carbon frame (Bianchi Vertigo) and a much tougher Trek Crossrip. My wife has a robust Whyte Somerset.
It goes without saying that I would ideally like to take my Bianchi to enjoy the hill climbing.
We've currently got a Cougar chariot which has had plenty of use when the 4 year old was younger. She's too old for this now so will be using it for our 1 year old. I'll therefore be getting either a tagalong or a towbar for her Frog bike (that's a separate debate).
So one of us will be towing a chariot, the other a tagalong. I really don't want to have to take the Trek bike. I can't work out which would be less likely to damage the Bianchi. I don't know anything about material strengths but my understanding was that carbon can be quite brittle... Any thoughts?
Thanks in advance.
Is it safe to pull either a chariot or a tagalong with a carbon frame? I mean safe from the bike's perspective, not the child's. If so, which do you think is more suited to carbon?
I'm going to Doussard (Lake Annecy) for a couple of weeks in June, with our 4 year old and 1 year old. Intend to use the fairly flat cycle path to travel up and down the side of the lake with the family, but also intend to head up the hills on my own for some early morning exercise. We've only got space on the roof for two bikes (plus roofbox). I've got a carbon frame (Bianchi Vertigo) and a much tougher Trek Crossrip. My wife has a robust Whyte Somerset.
It goes without saying that I would ideally like to take my Bianchi to enjoy the hill climbing.
We've currently got a Cougar chariot which has had plenty of use when the 4 year old was younger. She's too old for this now so will be using it for our 1 year old. I'll therefore be getting either a tagalong or a towbar for her Frog bike (that's a separate debate).
So one of us will be towing a chariot, the other a tagalong. I really don't want to have to take the Trek bike. I can't work out which would be less likely to damage the Bianchi. I don't know anything about material strengths but my understanding was that carbon can be quite brittle... Any thoughts?
Thanks in advance.
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I used to find that my heavier mountain bike seemed to be better at towing duties than my ligher one (both aluminium framed though).....
The seat post is alloy.
The chariot attaches to the quick release skewer.
Previously used both an old mountain bike (with semi-slick tyres) and then the Trek Crossrip to tow the chariot. I found both easy to tow the chariot, both fairly robust bikes. I'm not worried about pulling the chariot as the tow path is easy and the chariot is light... Just worried about my bike :?
But, what happens is that the bikes get scratched - either at the attachment point or having to lean the bike against various items when getting kids in/out/off/on.
I've done a few holidays now where I'd love to have my best road bike - but take my CX as I can put a childseat on it or tow a trailer - and leave it outside/around the place without worrying about it being damaged/stolen....
If I do get out for a solo ride then it's a bonus and whilst my strava times may suffer, it's still good training ...
I towed my kids for 10 years using an aluminium seatpost (using a trailgator), and it had no effect on the seatpost at all - it didn't even scratch it. I would be more worried about using a road gearing system for towing, but if it's canal paths you should be fine.
No problems yet
Anyway consider that because it's supposed to be more stable than a Trailgator type of tagalong. Plus works with rack or even child seat too if you the the trek and seat for your 1 year old.
Whichever way you look at it material wise carbon is more quirky....
A scratch can be fatal... or not....
I have some really strong carbon wheels but I use some cheap aluminium ones on my trail bike when riding uplift days
They might be a lot stronger but a single scratch off an errant rock and they could be toast so I just spend time worrying.
I recently scratched one of the aluminium rims .... nothing even spectacular - just scratched against a stone (indeed they were only on because I'd not changed them) but that might potentially have written off the carbon ones.
In a similar way.... you might well get away with it... but adding the tag along - just getting distracted and such could lead to expensive damage. If it was me I'd prefer the peace of mind.
Offset axel can help to get past frame problems.
Hydraulic disks feel much safer