Skidding: difference between track and road frame

It's down to skills.

I don't see how the shorter wheelbase answer works.

To make skidding easier less friction is required between road and tyre.

Friction is proportional to the force perpendicular to the surface.

On a really long wheel base bike, the reaction acting through the rear wheel is decreased and so it is easier to skid.

This can be seen by riding a tandem with on one on the back, you can skid really easy.

Using this we can say that it is actually easier to skid on a longer wheel base slack geometry road bike. So your inability to be able to skid your conversion was a skills thing.

-1
long wheel base and road forks - try to skid brick... it is everything to do with short wheel base and forks angle + transfer of rider's weight towards front wheel when about to skid...
you talking about skid when using brakes and not cranks...