Changing a flat would be more difficult. I suppose an axle pin that can be pulled out one side could make that simpler. the only reason for a single wheel and tire is to keep the rear of the trailer as slim as possible,(license plate slim, in my case) but if the wheel(s) were moved forward to a wider part of the trailer, a single frame rail with a drastically shortened axle mounting two wheels in the conventional hub mount manner could be used. Not sure how that would affect tail wag. I prefer to keep a single wheel as near the rear of the trailer. Another option would be dropouts (with a lock cap, as on the lower end of a piston rod) to allow the wheel to be removed like a bicycle front wheel.
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