Is the snow roof rake useable on a semi tractor trailer?

It will reach but wont be able to get the middle portion only the outside 2-3'.

You should be able to but keep in mind you will probably need to extend the handle all the way out which means you will need a lot of room to do it. It might not work if the trailers are all parked directly next to one another.

You can rake snow off of anything you like with this snow rake.