I have a vinage cruiser bike that I bought at good will a few years ago. I put a toddler seat on the back & 4 yo DD loves to ride in it. She is outgrowing it though. I have been looking for a new option. We ride a lot as a family, & she can't keep up on her tricycle. Do any of you have the trailers you can attach & pull behind the bike? I guess that looks like the best option. There is also a Wee Ride co-pilot trainer that attaches to the back of the bike & almost makes it look like a tandem bike. She could pedal, or just ride. But I'm worried she wouldn't be as safe on this. We ride on a gravel road, so I wouldn't want her to fall off! Has anyone ever used one of these? Thanks!