I have a 2004 1800 Goldwing trike and the first thing I added after my first full day of riding was the handle bar risers by MBL. I added the Standard set that raises the bars up 3/4 of an inch, brings them 1 1/2 inches closer to the ride, and narrows the span by 2 1/4 inches.
I got mine from Chrome World for $75.00.
After a long day of riding no shoulder or arm fatigue.
Dale