I'm no lawyer but my thought would be that he will be fine unless Smitty has a copyright... or patent or whatever the legal paperwork that would be required is.Whole idea by Smitty was a light weight, easy to build, easy assembled, easy pulling, easy disassembled $15 sled.
Read on IS Smitty sent the company an email with his dissatisfaction over the use of his name and design without permission. Lawsuit coming?
That is one of the more practical designs, pops apart for easy transport, I still have a set of skies and will do one like that, the idea of the ladder one was so I could sit on it, and not have to bend over getting things out. I must have some bigger bolts around here someplace.
Made two like this, best way I've found to transport gear even in snow cover.