Hello Dan & Linda;
We do not have any experience with a single-wheel trailer, but after reading posts from and speaking to other tandem teams, we chose the Burley Nomad. The majority of the teams who had experience with one- and two-wheeled trailers felt the handling was better with a two-wheeled trailer. They said a single-wheel trailer seemed to exert more forces on the bike.
With regard to the question about the right tire dropping off the pavement, that has not been an issue for us.
Because the trailer tongue is angled, the entire trailer is offset to the left as you tow it. Our tandem has flat handlebars with twist shifters. The right trailer tire lines up with my right hand, so all I have to think about is what the surface just below my hand looks like.
If you are close enough to the pavement dropoff that your right hand is beyond the edge, you are already close to a spill, but not because of the trailer.
Prior to buying the trailer, I had concerns about how the tandem would handle in tight turns, as a tandem is already a long vehicle. The Nomad seems to have the same turning radius as the bike, so I hardly give it a thought while turning.
I have found it impossible to make a right turn sharp enough to cause the rear bike tire to contact the trailer tongue. It can be done while walking the bike, but certainly not while we are riding it.
On our Denmark tour (http://roediger.crazyguyonabike.com
), we used the Nomad and rear panniers, as we needed the extra volume. For our May '05 tour of Belgium, we plan to take only the Nomad.
Without trying to sound like an ad for Burley, our experience with the Nomad has been very positive.
Wesley & Karen Roediger