Hi I'm just wondering if anyone knows if you can swap around chassis on the silver cross prams? I'm a new mum with a 3 week old little girl and have the silver cross sleepover pram....which I find so heavy and a nightmare to push as the wheels are big and don't rotate....I really wish I had of tried out prams before I bought this one...lesson learned! Anyways instead of buying a whole new travel system I was wondering if the carrycot of the sleepover would fit the wayfarer or the pioneer chassis? It's a beautiful pram and it just seems a shame to have to get rid of it!