Wow what are the odds of that???
The time I spent studying that Omnibot brochure! They are so mythical to me having never seen one in the flesh. But I kind of like it that way, I feel if I saw or bought all of these it would take away from the mystery of them.
I was fortunate that once I got a limb of a combiner my Mum would then actively search out the others to complete the combiner (as birthday or Christmas presents of course). The only ones I didn't complete after getting a limb were Devastator and Piranacon. Picked up Devastator once I got back into collecting as an adult but have never gotten Piranacon. Though I'm very keen to get the Generations Selects Seacons now, kind of like what you are doing.
Triple changers were cool, the only one I had was Octane, who I personally feel is a great toy! Funny that you mistook the orange semi for a Transformer. I watched Go Bots as a kid but for some reason never owned any of the toys. I guess I can be grateful that I got the real deal instead!