Am looking to buy a double MB second hand but as new as poss, only thing is the only ones I can find are Urban, I have used the Terrain single before and found it great as I do a lot of off road walking. Has anyone used an Urban off road and if o is it any good, I know you can fix the front wheels but still a bit unsure as the swivle front wheel on the P&T sport double I have atm is crap when used as a fixed wheel.