I had seriously considered getting a MtnBike with like a 750W or 1000W motor on it. And slap some panniers on it. But when I explained to them how much weight I'd need to have it help me ride back up how many miles... there like yeah... no... it's not gonna be able to do that much for that far of a distance.
One place in D11, sometimes I'll bomb along down the road down into there on the MTB. You're essentially riding brakes the whole time down. It's not too bad... conserves a lot of energy on that way down. The only thing is that then you've got a little more exertion on way back up since you gotta push the bike up, or ride it when the road flattens up occasionally.
And then the last switchback to Hwy 2 is deeply rut-grooved, so you'd have to pick it up in the center and carry it thru those erosion ditches on that trail. And that's at thee very end of the trail. I can do it with regular hardtail MTB (this one I've had since '93)... but the thought of doing that with an MTB with a motor and batteries is another ball of wax altogether.
And ya gotta be careful too, comin' down one time after our first nice batch of rains... came around the corner to all this fallen rock...
Thankfully I'd seen a Family of Does on across over on the other side so I had already slowed down, otherwise this rockfall mess just might have caught me by surprise, since I was pushin' it a bit to hurry up and get down in there. Reminded me of a good lesson from riding Desert... if you can't see around a corner or over a rise? Slow way the bleep down since somebody else could be comin' from the other direction and smash right into ya!