According to Moebius Models, all of the their ventures into big rig models were successful; Trucks and trailers. Which means they broke even and made money! As far as being discontinued, the way models and virtually any product for that matter are marketed, manufactures make a single run on several runs of an item. Once those batches are sold out, another run is not made until a large enough demand warrants them. It wouldn't make sense to invest tens of thousands of dollars in tooling for a model and not use them in the future to make more money in their investment.
Moebius Models assured me they are committed to offering more big rig truck kits in the future. However, they said tooling costs have risen since their original truck and trailer kit projects were "backed - up" (their word) with projects from their other line of Sci Fi kits. They said truck kits "eat - up" (again, their word) significant amounts of money of their budget for new tooling of projects and they couldn't say exactly when the would be offering any new truck and trailer kits.
So, all of those that said they were going to buy the truck and trailer kits before they announced them, great! Those that procrastinated or just discovered those kits, better luck next time!
As far as I know, no one. When the 1/16th scale kits were first issued back in the early 1980s, an Australian parts supplier offered several 1/16th scale resin items. Spoke Trilex wheels were just one. Sadly, they haven't been re-issued since the early 1990s.