For fun:
40 tons is 80,000 lbs.. You'll need a lowboy probably at least with a rating of 100,000lbs (you have to consider the weight of the trailer on the rating). Then you need something to pull it.
The highest towing for an F150 is about 10,000 lbs so you'll need 10 of them too.
A diesel F450 can tow about 30,000lbs so you'd need a few of them.
Here's a Ford towing your tank on a trailer (kind of) same weight at least.
Just to give all an appreciation for how much stuff weighs and how much power and torque is sitting in that Leopard as well. Tanks are pretty darn cool.
Ron