Back about a decade ago I purchased a Bafang geared hub motor from J.R.Holmes, laced into a 16" wheel for use on a Bob trailer. I don't remember the lacing pattern. It was used for several years on a friends Bob trailer and is currently waiting to be used on another friends one wheel pusher trailer. May or may not happen, but I'm visiting him tomorrow if you are curious about the lacing pattern. This unit is a slow wind (for a 26" wheel) and tops out about 15MPH with a 20 amp controller and a 48V Ping battery, so about 1000 Watts available. It was used on a 20% grade and did a good job.
I also ended up with an extra Wilderness Energly BD36 and purchased a set of spokes from WE that allowed me to radially lace the hub motor into a 16" wheel. That unit is still in use today on a one wheel pusher trailer for a friend's hand cycle. It pushes his trike over 20 MPH. The little original controller is rated over 30 amps and he is using a 48V ping, so about 1500 Watts available.