I have a 30kg e-bike and I am planning to get a trailer (ibex) for a longer journey. The total weight plus luggage will be 142kg (65kg (me) plus 30kg (bike) + 12kg (trailer) + 35kg (luggage) ).
What about a recuperating brake mounted on the trailer? Is there any small and light-weight system available or can it be build?
A long descent, e.g. 1000m and more, should give some energy back and help to brake.
The ideal would be a dynamo that act like a brake, i.e. offering adjustable recuperation so it works like a brake but creates energy.
As I have 3 batteries, two active, there shouldn't be a problem with charging. (it's a Bosch that needs the 5V trick ...).