So, nothing to stop the rubber from flexing backward if there’s a weight shift, dumping the axle out of the V and off the jack.
That kind of rubber can also split or chunk out. It’s suitable if it’s backed up by something that can’t flex. Even on boat trailers it’s usually part of a larger metal V, and in that application it’s just a bumper and not supporting thousands of pounds once the boat is positioned on the trailer.
I like the idea, but the rubber needs to be backed up by something solid. It can be a bumper or a cushion, but shouldn’t be used as a support.
