I have two, 2 year old girls, and I had to do everything with my girls. Leaving them on a trail why I went out wasn't an option. So I took a bike trailer cart thing, added my own touch to it and BAM, one all terrain twin 4x4 cart thing. You can buy them I guess, but that wasn't an option on my budget. All it took was some work, and a lawn mower tire and I was in the thick woods doing what I love and my girls. They have there own little hide away from black flies and I can push them easy enough that I can go out and do lots.. If you can find one at a yard sale, and you own a hack saw, you can make a great ride too. I would insert an image but I'm too new to make that happen I guess.