Being in business 40 or so years, we have seen a lot of products come and go. The following units have all been out of production for 10 or more years and are no longer supported:
Model 35/Model 35EZ
Lanyard Cable (steel only)
Tire (13.5x6.5x6 only)
Model 60 (Orange). Also, Model 70 (looks similar to the 60 Orange).
Old Supertow 2 (2 caster wheels in front)
Model 60 (Yellow)
Line Boy, Phoenix Mfg. or "Plane Mover" products.
Ace 1000 / Glider
Old Supertow (2 caster wheels in front)
110 Volt AC Powertow (both gear motor and non-gear motor varieties)