Another vote for the wheel dock. Not sure if you noticed the one on my trailer the last two Maggie Valley visits or not. I recently used it to help a buddy pick up a little Honda Rebel he bought for his grandson. We used a piece of 2x4 as a spacer up front and it held the bike just like it does my big bike. Love that thing.
The wheeldock has another use. You can mount it in your trailer using a temporary bolt system that I believe comes with it. Then with a few quick turns of the bolts, the wheeldock lifts out of your trailer. You can then use it on a concrete floor to hold your bike vertical for odd jobs or to save space in your garage. No bolts would be necessary to hold the wheeldock secured to the floor.
And as far as spacers go, I had them make the dock wide for a Heritage Softail's front tire, then had them include a spacer for my '11 RGU. Now that both of those bikes are gone, I used a piece of 1/4" plywood that I custom cut to fit the dock, then secured it in place. Now the dock fits my '15 RGU perfectly!