purpose
the front and rear are really designed for two seperate uses.
The front is a great way to load/unload and move your vehicle around the shop. the simplicity of the installation and design work well in a variety of situations.
the rear was originally designed as a shop tool to help facilitate maintenece, installation, removal and portability of the kits themselves. it simply offers A convienient way to lubricate and adjust your chains/track, with the added benefit of stabilizing the bike when not in use * think sx kit *
obviously one could opt for cheaper and create inovative ways to do part of what each of these offer, but when used independently or together, they offer advantages that others on the market do not.
thanks for looking and the feedback.