Is your trike .....dirty and well used or spotless and cleaned and polished after every ride ?
I will explain why I asked that leading question after you have had a peep at the next questions .
All designed to illustrate or discover any issues .
What axles are you using ?
Quick release
19mm bolt _ allen key
mini allen keys
Do you pressure wash the wheels ?
or Use any Strong cleaners/degreasers
Drum brakes or Discs
Are you using ICE supplied bearings or self supply ( in which case what brand and seal type )
Pleased to help and Nigel "Tiger" appears to be on the right road with his comments .
Regards Kevin D.TEK