Ubcos are ok for farm tracks etc, but being without any clutch they do have a tendency for the front wheel to lift when climbing steep hills, and then you don't have two wheel drive as one wheel is off the ground.
Riding them in steep country is a different technique to riding a petrol two wheeler but they are very quiet when compared to the petrol. The newer ones have sealed hubs so the water thing is less of an issue.
A E-mountain bike can pretty much go anywhere a normal mountain bike can go, you still have to pedal but you will not burn as many calories. They are a heavy bike to ride when the batteries go flat.
Center mounted motor is a much better way to go than hub too, more weight forward and the motor drives through the gears, so you can get balance speed and torque better compared to a direct drive.
One option is to get a bafang kit, if you are halfway skilled in diy you can retrofit it on a normal mountain bike in a few hours. I have fitted a two of them.
It has a throttle in addition to pedal assist, so you can just sit on it and roll along, but with this you aren't supposed to ride it on public road, you can leave the throttle disconnected and it will still work as a pedal assist. These kits can be very grunty, a 250w isn't overly strong, makes it feel like you have a tailwind but wouldn't be much help on a steep hill, a 500w really throws the bike forward as the assist kicks in, again this level of power is verboten on the road. They also go up to at least 1000w. This would be cargo bike territory, it would eat batteries fast and would probably flip a mountain bike on a steep track.
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