What makes the MMM push 60?

[Finnster]

It comes down to the amt of power you can put out (and put to ground.)

For a ~10-11lb truck I would think 2500W+ to ground would be needed.

You can do this w/ an XL even, but if its only 70ish% eff, you are putting out 600+W of heat, that's why high-end hi eff motors are better suited for huge power.