I concur with the suggestions about obtaining a (sturdier) used bike for the purpose. WAY back when my kids were that age/size, and I wanted to take them along for rides…I opted for a (used) steel road touring bike. It also had somewhat larger/sturdier wheels. But I didn’t pull a trailer. I went with a rear-mounted child seat. It worked out well, and I used it for several years for both kids. Just a note for you, or those who do go with a seat instead of a trailer: The key be being able to ride longer is ensuring the child is satisfied. Make sure you have everything for diaper changing with you. Additional considerations for the kid: sunscreen, sunglasses/goggles, snacks and drink, and toys. And remember…ANYTHING that the child has should to be tied on or you’ll be backtracking frequently to fetch things they discard. And don’t make the rope/string so long that it gets tangled in the spokes. Have fun. — Dan