The New Wheels Roll ...

 I took my flatbed with the new 20" twankies for a spin yesterday.   Worked like a charm.

In this photo you can see that there is plenty of clearance for the neck of the bass.

I just found a awesome page on treehugger.com about bike trailers.   Check it out.

http://www.treehugger.com/bikes/bicycle-cargo-chapter-2-bike-trailers.html

I upgraded the wheels on my flatbed trailer, by stealing the bigger 20 inchers off my canoe/kayak hauler. 

You can see how much bigger they are.   I once saw a custum auto place called Twinkie's Twenty inch Twanky's; so that's what I'm calling this, the 20 inch twankies.
   To make it work I had to replace the axle with a longer pin.   The one I had was too long so I just slammed a bunch of washers on there.   Works pretty well.  Theoretically ...

  

These sweet new rims ought to make the bed of the trailer more level.   Plus, with it being about 3' higher off the ground it should give the neck of the upright more clearance.  

  The old wheels made the neck drop down a little too low.   Never was a problem, but looking at it, you'd think it was a little precarious.  The twankies will lift the headstock up off the pavement.