Based on C&S 99201 at the Colorado Railroad Museum
MTL trucks should work just fine. Honestly, any brand should work.
The prototype at the Colorado Railroad Museum doesn't have couplers.. instead, it has a drawbar to the tender behind it, and the tender has a coupler on it's rear end.
David Wolf did an awesome job of animating the Zscale version of this model.. check it out..
http://www.trainboard.com/highball/index.php?threads/dcc-powered-rotary-snow-plow.96000
Kevin Smith also painted up one.. here's a video: https://youtu.be/jtv7ptc2fx4
David Wolf also had me make a few changes to make it easier to motorize, and even possibly throw snow!
https://www.shapeways.com/product/7YB4E8P2W