DONALD - The back one looks like an SMV (slow moving vehicle) emblem. Not sure about Canada but in all US states they're supposed to be displayed on ANYTHING that moves less than 20 or 25 mph on public roads, That's 32-1/4 or 40 KMph in Canadian. ;-) And not used on anything stationary or that moves faster than that.
But in most rural areas you'll see them hanging from fences, mail boxes, tree trunks, barns, etc. which is NOT legal. And most are so faded they can hardly be seen.
TOM - The company I drove for had "Spotting Service" in their name, which meant I dropped & hooked an average of at least three trailers every day. Sometimes as many as 10-12 in an hour. LOTS of short trips which means I'd have probably worn the seat belt latch out.
RODNEY - I think IL did away with the lettering req't in the mid/late 1960's on personal pickups but larger personal & all commercial trucks still require it. Dad never did the "& Son" on his pickups. He'd have his first name lettered in smaller letters on the driver's door and my name on the passenger door since I rode "Shotgun" just about every where he went if I wasn't in school.
There used to be guys who made a living from lettering trucks. Guy Dad hauled livestock for had ten letters in his last name. By the time he lettered both truck doors and the nose of a new trailer the letting cost almost as much as the new truck! ILL required "Empty weight" on the doors.
Think I mentioned in another post IL also req'd a manditory every six month safety inspection, all lights, brakes, tires, alignment, all glass windows, and your flares & reflectors/flags, etc. checked and a sticker put in the windshield. That was required till about 1984 or 1985. I remember an off-duty but uniformed ILL State Trooper pulling his pickup up behind my truck one morning in the inspection lane and I casually made the comment, "I'll be glad when ILL requires these inspections for cars." He asked why. And I replied, "So I won't see so many cars with burned out head & tail lights like I do now since you guys won't pull them over." He wasn't so friendly after that! ;-) One day earlier that week I had a 7 AM delivery appointment in Chicago and caught & passed a car in pea-soup thick fog about sun-up. Fog so think I could only see ONE strip of the center lane divider on I-55 around Bollingbrook, IL. Car had one dim tail light and one head light aimed down on the ground about ten feet in front of his bumper.