Me and my partner are trying to build electric pull carts to assist elderly Korean women and men who collect paper boxes for a living. These boxes are sold for recycling.
They work virtually at every corner of Seoul and it breaks our heart seeing them pulling those heavy carts up hilly roads in the city.
We wish to convert their manual carts to electric. We're no engineers so we need your advice on how to mod their carts to electric.
Below is a photo of how the wheels are attached to their carts.
I thought the best way is to purchase an electric motor hub (like this) and install it on one of the wheels and connect a new axle shaft below the body of the cart across to the other non-powered wheel. We use two brackets with radial bearings to connect the drive axle to the body - like these. The batteries shall seat flat in the cart evenly aligned in a row, keeping the cart balance.
My question is could the bearing and the bracket hold the weight of the body and load?
UPDATE: I'm getting many more replies here than the ebikes subreddit. You guys are a bunch of helpful people. Kudos to you!