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Version 4 is our latest version, incorporates version 3 onto a rolling cradle.

Version 3 incorporated version 1 with a bearing ring, large deck with a glide ring installed and wood rails with walk over ramp. 

Version 2 attempt to use pressure treated wood.  Only lasted about 2 weeks and started to fail.

Version 1 was a simple pipe structure that pivoted on a single center bolt, but dragged on top of the rails.