GP-00007
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For Extension plate goes the same as for Luggage rack - it was designed to carry lighter soft bags and/or Rotopax container (1 gallon). It can carry as much weight as mounting points (threaded inserts in the plastic tank) can endure, but I don't recommend putting more then few kilograms to the back, because of possible bouncing issues. Check this blog post, to learn how to prevent bouncing of the rack.