Last week I was traveling south on I-15 in UT and saw a canadian army convey also headed south I have never seen this before does this happen often.

any thoughts?

Where on I-15 and are you sure it was canadian? I.e were there maple leafs on the trucks etc.

Well maybe they were headed towards one of:
A.) Hill Air Force Range
2.) Wendover Air Force Range
C.) Deseret Test Center
4.) Dugway Proving Grouds

And it probably isn't that out of the ordinary. The US does a lot of training and whatnot with other militaries.

100% positive they were canadian. Saw the maple leafs on their shoulders.

In the US I sometimes see military convoys as well. Mostly trucks and humvees traveling on the highways sometimes. I do not live near any bases or anything so it is not normal, but it does happen.

Maybe it is the same thing in Canada.

The US could be doing joint excercises with Canada.