I'm curious about this. I've seen kids even older napping in the stroller, so I know it's not an urban legand. On our last three trips, we had two different three year olds and naps definately were not going to happen in the stroller no matter what. But both kids were done with naps by their 2nd b-day. (And one child never fell asleep in his carseat, even as a young baby). On our last trip, the 11 month old was so excited that his nap was very late the first day, at 6pm. If our youngest, who is now 2.5 years old will nap, then it will alter our plans. Our plans do not include a nap for him, but we're not staying out super late. (Two of our nights will be past his not-napping bedtime. He goes to sleep at 7pm on days he doesn't nap. He goes to sleep at 10pm if he naps - even if it was just a 30 minute snooze). We're planning our schedule mainly around our 5 year old since she's the one who will make us all suffer if she doesn't sleep enough.
*We have 7 days of parks scheduled, so also comment if naps did start happening by the end of the trip. Our off day is after 6 days of the parks, so not in the middle. Our stroller is comfortable, has a sunshade, and reclines. But that didn't make the other kids nap in it. I'm hoping a 2 year old is different enough from a 3 year old to make naps happen.
*We have 7 days of parks scheduled, so also comment if naps did start happening by the end of the trip. Our off day is after 6 days of the parks, so not in the middle. Our stroller is comfortable, has a sunshade, and reclines. But that didn't make the other kids nap in it. I'm hoping a 2 year old is different enough from a 3 year old to make naps happen.