When I was a kid we would go on field-trips to the Tonka toy factory. It was the best dang trip ever. You got a free dune-buggy at the end!
I had the Orange and Purple dune buggies!!!
My Tonka dump truck still survives (30+ years later). After I stopped playing with it (probably had something to do with puberty, or some such), my grandpa started using it to hold his scrap metal.
When he died last year, I found it under the side of his house, full of metal bars and chunks. It was so great! The tires were flat, but I was happy to see that it was still used. I took it out and gave it to my nephew.