How does it pull? I like the idea of little or no weight on the bike. It seems a little tongue weight on the dolly would be good for pulling though.
Most of us that have pulled trailers a lot have experienced the oscillations that can occur with a trailer with too much weight behind the axles.
If the dolly, by itself, were loaded and no tongue weight, it might want to whip a bit at speed. That would not be fun on a bike.
I have found that if a trailer starts to oscillate, a few quick back and forth jabs of the steering wheel will interrupt the whipping of the trailer. The idea is to induce a frequency out of phase with the frequency of the trailer oscillations.
Floyd