Pat,

Think the booster is the only way. The trim motor wants too much current for the GSA to supply. I am in the process of doing some of my wiring and this is the schematic I came up with. NOTE that I have not tested this so can't tell you it's right with 100% confidence but think it's in the right Zip code. Also I am using a trim switch on the stick and not the center console so you won't see the switch wiring that Kitfox uses. I think the VPX will swap the power and ground when you command nose up or down.

Hope this helps

Gary

Autopilot and Trim.jpg