Are those collapsible, umbrella type buggies any good over rough ground? DS is 3 and has outgrown the Maxi-Cosi Mura 3, both in length and weight. He can't walk more than about 3km, less if he's already tired, and as that's the distance into town and back I still need a pushchair. It also needs to be able to cope with forest paths and snow!
Any suggestions or advice?