Is the Nexus 3 speed hub strong enough?

[MtnGoat]

... When I hit the bottom of the hill I start pedaling to catch up with the engine as I start up the the hill. Usually about 1/4 to 1/2 way up the hill I start having to apply a little pressure to the pedals. This is with a 2 stroke engine. As I hit the top of the hill, I ease off the pedals and pick up speed.
No gears, simple.
...

That works for about 1/10 mile of my 4 mile 2000 ft hill climb. That's to get to my house from anywhere, so it's unavoidable. So I can gear my bike for either the mountain, or the valley. Either way the compromise is significant.

The simple solution: gears.

 

[BSA]

If you want something that'll take an atom bomb and still survive; get a Sturmey Archer 3-speed hub. Very popular in the fifties and sixties on British bikes. Made out of proper stainless steel. Quite a lot were sold in the USA. They are now back in production to my knowledge, all though I'm not 100% sure.

BSA