Can I go wider than 2.5 metres?
You can build your tiny house on wheels larger than 2.5 metres wide but it does mean you will have to have it moved by a professional towing company and it will become an over size load which adds some cost and complexity to moving it.
It also means you wont be able to register it as a trailer or caravan as it exceeds the legal maximum. It can be done it just makes it a little harder to move. A lot of people are happy with this especially when it is going to stay in one location for an extended period of time.