"The Truck Got Stuck" & "Hair In My Eyes Like A Highland Deer" are 2 of the most requested songs I've been getting nagged about for karaoke. Since these tunes are from a canadian artist and don't appear to be released by SoundChoice or any other karaoke company, I bet SoundChoice could easily secure the rights.
I don't know about "easily", since the people I've talked to at one Canadian label say the Canadian artists (or publishers) are more difficult to deal with than the US counterparts.
Plus, the song or artist has to get really popular in the US for it to be considered by a US label. Other Canadian country artists such as George Canyon The RoadHammers have been very popular at home, and get some play in the US but have only had token representation on karaoke. Corb Lund still looks to be doing the bar circuit here, so it might be a while before they get popular enough down south.