That project was inspired by a pusher trailer built by JB Straubel[1] (co-founder and former CTO of Tesla), and in Straubel's write-up he addresses this:

> Dynamics:

> Despite the facts that I shortened the trailer of the Gen-2 pusher by two feet and added more IC horsepower and much more pushing force with the ability of the AT to downshift...I have still found it basically impossible to get into a condition of oversteer. (This is where the car would want to turn into the direction of the turn if you take your hand off the wheel, normaly if you release the wheel a vehicle will straighten itself out of a turn) Even in relatively tight turns with the trailer at nearly full power, the car wants to straighten itself out. The shortened trailer also drafts behind the EV much better further improving the mpg.

[1] https://web.archive.org/web/20120319173545/http://www.jstrau...