Hi- I have been looking at a backup trike to my addmotor and ran across this brand. I am seeking some feedback on these two things: I was concerned when I saw two things. One some other members comments on their bearings going out. We have fairly bumpy and concave asphalt roads in my neighborhood. Secondly, I was curious about the 500w motor power for hills. We have a number of short steep hills around here that my 750w does great on. ( I am a 150#) Thanks in advance!