An extended long/double kong can be a tricky thing to master, and I'm wondering if it's more or less effective then just a single kong then kicking/jumping off like running on all fours.
A long kong is more fluid and aesthetically pleasing, but it's difficult to maintain forward momentum. A "quad run" on the other hand is not as fluid, but has more power and forward momentum is replenished with each step. A quad run also tends to give you more options when it comes to exiting the maneuver and/or attacking a second obstacle.