I used to have a bike trailer for my boys when they were young. Like 2 and 8 months and they could be strapped in side by side and you could close the cover to protect them if it started raining, carry their bag behind them in the little rear compartment, and kept the bugs off of them.
Later we had a trail a bike for my ex-gf's 8 year old. He could ride his own bike but on the longer trips he coudn't hang but on the back there he could help when he wanted to or when we encouraged him to on hills.
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1991 Toyota Paseo 38MPG baby
1995 JettaGLX VR6turbo project car