This may be the largest in the world. 
Tree spade is 143 inch in diameter
Route ball weighs 22,000 lbs. aprox
Tree spade weighs 35,000 lbs
This price is for the "trailer only"
We've moved 53 trees to date with it
It has been driven to Florida and back to move 20 Palm Tree's
It is self engineered & made, road legal in all eastcoast US states
Ability to transplant 55 foot tall trees
3 independant air controlled axels
Rear axel is hydraulically steerable
Spade blades and doors are remote controlled. 
It is currently located in upstate NY, USA.