I really like the look of the baby jogger city mini. I have a P and T double that i'm using as a single for dc3, so I'm thinking of selling it and buying a city mini instead. How does a city mini do on rough ground and do I need something heftier for my main pushchair? i walk more than 3 miles a day for the school drop off so i don't want a rattly pushcair .Any advice please!