This HP Velotechnik Scorpion was built up with a pair of dyno hubs. The purchaser used one hub for front and rear lights, and the second through a B&M eWerk to be able to charge his GPS, cell phone, etc.

Challenge also offers dynohubs on their tadpoles.

There may be others, but they arent coming to mind. I am afraid no medium or low cost trikes can be fitted with dynohubs - at least none I can think of.

Oh, any delta trike can use a conventional dynohub too.