A very good resource:
www.triketalk.comI had a Motortrike kit on a VTX 1300. It was Okay, but I would look at others before I went Motortrike again.
I have know several others with Voyagers. They seem to like them
IF for whatever reason they want to go back and forth between 2 and 4 wheels. Those who just wanted to stay triked didn't care for them and each one went and got a regular kit.
What many, probably most trikers do for the front tire is to take a rear MC tire and put it up front with the rotation reversed. They don't use a radial, too much flop in the sidewall on corners. The tire has more tread so lasts much longer. It's reversed so the pressure on the splice in the tire is proper for being on the front. The other reason it's reversed is so that the tread throws water straight back instead of at an angle and under the rear tires. I never had any hydroplaning on mine. I didn't ride fast in the rain either.
Many folks on the board I listed above have gone the Voyager route, sign up, and talk to them.