I liked Erector more in later years, but not for his name. His vehicle mode (minus trailer) is based on a vehicle we had dozens of at my job -- a short-haul tractor truck called a "Yard Mule". Mostly used on railroad yards, some shipping companies use Yard Mules to pull truck trailers from a pen to a transfer center to be loaded, or to have the trailers' containers loaded onto flatcars or ships. They can also carry road trailers over short distances, not unlike what Huffer did for Optimus Prime in "Heavy Metal War".
Great stuff as usual!
I'd honestly kill to design my own robot toys, lol I'm going to be doing some robot designs for like a comic maybe or something later in the year just so I can say I also did my own not just someone else's I.P., of course as well as more Transformers designs and I think I going to try my hand at some Gundams and other assorted robot stuff. Basically lots of robots on this horizon for me, lol