Vans in Ontario can have either plate on them. I think the one with the sticker on the front plate is used for trucks and commercial vehicles. I just moved to Ontario and put standard car plates on my van. I would thing a "B" would be the same. I thought about Veteran's plates for my vehicles but didn't want to do the paperwork.
I haven't licensed my RV yet. I need to fix it up a bit to pass the safety. At least it's 30 years old and doesn't need that emissions test done. There's a lot of camping around here so I want to get at it as soon as I can in the spring.