Jeeze, I guess I did, I must be getting old. It is a cool idea.

>But, a rollerblade version? Can you explain...

Setup aside, going fast on roller blades is much more controlled than on a skateboard. You can't bail, sure, but you also won't get the death wobbles.

At speed, you can inline your feet (one foot in front of the other) and put 80% of your weight on your back foot, since the only instability is front to back. This guards you against pebbles, cracks, and what not. You have the same side to side stability as a someone riding a bike.

Skateboards at speed have instability front to back (obviously your weight is back to guard against pebbles, etc..) but also side to side. Keeping the death wobbles away takes a lot of practice.

Behind the Blazer I got up to 45Mph on my blades, but not even close to that on a skate board (with tight trucks and soft wheels). At the time I considered myself to be about equal in terms of skill with both.

(edit for line break)