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The design is OSE Specifications-compliant in its simplicity. Two pins are required to remove the wheels. Stock 1/2″ mild steel is used throughout, with minimal fabrication. A question is pin alignment, but if they are tapered, they can be punched in and out easily – as they are readily accessible. If there is any looseness, a cam can be added readily to the pins, to tighten the assembly against the frame. Moreover, it would require to a vertical holding mechanism (to the fram) to hold this in place as the assembly is attached and pins are inserted – so just one person can take the wheels on and off. All these issues are readily implementable.
Even though this is super simple and doesn't show the cam - this is what we are trying right now and it should work. It is the simplest of all the designs. It also allows for a single person to mount this - as it slides right on to the frame from the side. This is a big practical consideration - one that none of the other entries have considered. I know this because each assembly is about 200 lb - and I am able to take this design on and off myself.
Good clamp-down mechanism with the opposite threads. The shortcoming as designed is up-down clamping, which is not present in this design.
This is actually the way to do this correctly - and this would be a winner for industry-standard methods of solving the problem. However, this would be for future versions of LifeTrac - for now, this is too advanced from the standpoint of easy fabrication.
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