I like the look of the Oyster Max and I'm fed up of using my Joovy which is now horrible to push now DC are heavier (2&3). Its hard to tell but photos of the Oyster Max look like a toddler might be able to stand on the back bar for brief rides. Anyone know if this is possible? Eldest DC mostly walks now but it would be handy to have him jump on occassionally when we need to get a move on etc.