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I work for Water for People Malawi and agree with Remi - its the transport that's usually the killer.
Mind you, in very rural areas you may have better disposal options if you can cordon somewhere off as a composting site of sorts or just empty the latrine, dig a new pit for the waste and keep the superstructure intact.
We are working on a new version of the Gulper, called a Rammer...and we have also just imported some eVacs from PID South Africa.
Happy to share specs for Gulper/Rammer.
Nicola