Crackle said:They do if you don't set them up right or the adaptor kit doesn't fit the bike properly - can't stress that enough.
When Son No.1 finally got a bigger bike, we had to abandon the Gator because it didn't fit his bike properly. Likewise I gave one to a friend and gave him specific instruction on fitting. He fitted it and it didn't work, so I got it back.
THEY HAVE TO FIT PROPERLY IF YOU DON'T WANT THEM TO LEAN.
If they do fit they're fantastic and as I say we had two, did lots of cycling with them, including using trains, try that with a tag-a-long.
I think I have one going spare actually, maybe two. I'll look in the shed.
Trains can be a problem.... If the policy excludes "Rann trailers" then they will not take a tagalong!
Otherwise just treat it like a bike.