Hi guys. I currently have a 3 wheeler pushchair,I think its the urban detour. Jack will be 2 and a half when this baby comes along and I don't know whether to get a double pushchair or not. I was thinking of one of those boards to go on the back so Jack could stand on that when he gets tired, but don't think it will fit and what if he gets so tired that he wants to sleep? Would buying a double pushchair be a waste of money? I have a bad back so a carrier or bjorn is not ideal. Really stuck on this one - any ideas?