Speaking of rigs that shouldn't be on the road..... way way way back when I was young and dumb I liked to waterski. A friend's parent had a small skiboat, and towed it with some massive Chrysler thing. Well one day on the freeway (while towing the boat) the trans on the Chrysler locked up solid which rolled the car, totataling it. Boat was amazingly unharmed.
So my buddy and me still want to go skiing and look around for another tow vehicle. I had a 1.8L Subaru Brat. Yup, we two idiots put a hitch on that tiny vehicle and went skiing. Boat wasn't all that big of a boat and it was in the middle of Ohio so the biggest hill was an overpass. Towed the boat just fine, actually. Got to the ramp, launched the boat, had a great day, and put the boat on the trailer - all no problem at all. Getting the trailer up the ramp, however, became another issue. Gentle on the gas, not gentle enough, front wheels spin, boat and Brat go backwards down the ramp. I lost maybe 4-6 feet of ramp sliding backwards before remembering I could put the Brat in 4wd. Idiot self engages 4wd and it came out without a worry.
Probably launched that boat with that Subaru 20+ more times over the next coupla years. One of the best vehicles I ever owned. Bought it for $600, sold it for $600, oil changes and two tires were the total maint for 3 years. Oh, and the cost of a trailer hitch.