I've had this frequency in my programming for quite some time now in my unconfirmed vhf list. I also have an entry with PL 136.5 for whatever it's worth.
I don't hear much on it, but it does pop up from time to time. I'm only about 4 kms from Hwy 17 (East-West TransCanada Hwy) and Renfrew is at the junction of Hwy 60 and Hwy 132 as well. So trucks can pretty much come from any direction through this area.
Judging by TAFL listings for the channel, take your pick of possible random users.

Could be anyone.
I know up my way I have logging channels that are active, but they're active repeaters. One of them also using one of the DMR systems in the area.
They tend to stay to those systems or the CB. Guess it wouldn't hurt to make up a section for these type of LADD frequencies. You never know what might show up. How often are transports from out west travelling east?
Which reminds me about of one of the convoys that came through here onwards to Parliament Hill and they had been using those channels.