I would reccomend getting a double at the least. In my experience of child 'portaging' the extra weight in relation to your centre of gravity really affects how much effort you can put in. You will have real trouble mashing cranks whilst sitting down, and standing up is a no go, for me at least. There is also the fact that carrying around the best thing you ever made can be incredibly stressful/tiring (traffic, descents etc...) and I think you will be grateful for a wider spread.
I would reccomend getting a double at the least. In my experience of child 'portaging' the extra weight in relation to your centre of gravity really affects how much effort you can put in. You will have real trouble mashing cranks whilst sitting down, and standing up is a no go, for me at least. There is also the fact that carrying around the best thing you ever made can be incredibly stressful/tiring (traffic, descents etc...) and I think you will be grateful for a wider spread.