I also have the pair of folding ramps. I got them from a plumber that I apprenticed under 40 years ago. He sold them to me for $30, I said that's a deal, he said do you know why? Of course I didn't, he said in the early 80's he had a flat tire out in the country with his 360 Honda and I was the only one that he could get to bring a truck to come get them.
I don't know how we loaded his bike but apparently, I brought a board or something.