Giraffe/Coker hybrid question

I got my first chance to ride a giraffe last weekend, and it got me thinking. The giraffe was fun, but slow and a little bit awkward. Every second or two I found myself wishing the giraffe had the wheel stability of a coker. So my question is: Has anyone ridden a coker-giraffe? If so, did you notice any major benefits or drawbacks from changing the wheel size? If all goes well, this might be my next unicycle purchase, but I’d like to hear from other people first if possible.

Thanks,
Rob