Total bike and trailer builder and believer of yore here.
One can fail to appreciate the additional breaking forces
and shifts in balance a loaded trailer introduces to the bicycle.
Where the trailer attaches should be as close to the center of gravity of the bike & rider as possible so the trailer's resultant forces have the least leverage.
The trailer hitch should be rotationaly neutral which is a gentler way of saying
if the trailer flips over it should not take the bike down with it.
If the trailer has its own breaks they should slightly and lightly lead the bikes rear break.
Being careful helps, I never wrecked, but do see how the addition of electrical assist does up the concern as it could result in more mass moving fast.
One can fail to appreciate the additional breaking forces and shifts in balance a loaded trailer introduces to the bicycle.
Where the trailer attaches should be as close to the center of gravity of the bike & rider as possible so the trailer's resultant forces have the least leverage.
The trailer hitch should be rotationaly neutral which is a gentler way of saying if the trailer flips over it should not take the bike down with it.
If the trailer has its own breaks they should slightly and lightly lead the bikes rear break.
Being careful helps, I never wrecked, but do see how the addition of electrical assist does up the concern as it could result in more mass moving fast.