Below I share my experience converting a regular lady bike to an electric trailer equipped bike.
This was intended to transport around 6 bottles of water (5 Liter/1.3 gallon each).
Step 1: The ideia
Step 2: And some measures to manfacture
Step 3: The choice of the electric kit
The specs are 24 V, 250 W. Because I ordered it from US, I paid a lot in Customs :-) I'll have the numbers in the end.