Originally Posted by
RoadRanger
You'd really freak out if you saw me zipping down the street at 30MPH on my 8" wheeled scooter.

Sorry, but you are wrong about that. Inline skates and skateboards have small wheels and can handle well at that speed. The trike you are looking at, IMHO, not so much.
I might put in heavier spokes right away, I'll see what the stock ones look like. Maybe a proper tightening and cross tying will be enough?
Butted spokes are the best choice for durable wheels. In this case, 14g double butted would be a good choice. Touching up new wheels (including "stress relieving") is usually a good plan. Cross tying spokes does nothing.