cjk,
From the inside of one tire, to the inside of the other tire, you have 61".
From the outside of one tire, to the outside of the other tire, you have 84".
If you remove the tire, you will free up about 3" on each side at the bottom. Then you have the spiindle to deal with.
You have two choices.
The easiest is to have the forklift operator lift the trailers up on your trailer in a manner situatuated where the tires will miss the wheel wells of the carrier trailer. This will probably mean going tongue to tongue in the center of the trailer.
The other is to remove the M1102 HMMWV tires, and set the hubs up on blocks of wood, not concrete, so the spiindle or axle center is above the fenders, and tie down with extra chains and binders, with emergency hand brake on.
Either should work, depending on your trailer length and the forklift operator. Good luck, and let us know how it goes so others may follow.