My daughter (4.5 yo) and I recently did 45 miles to Weston Bend, MO on our triplet. We pulled a two wheel trailer fully loaded. We camped over night and came back the next day. Fantastic time, but of course lots of work. That was our longest trip to date. We have also registered for the Bike Across Kansas, 485 miles in 8 days. This trip is supported, they take our gear from one site to the next.