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For 250 bikes also consider the Yamaha Virago or VStar 250. They have a very long stroke engine and make good torque at low rpm. The Ninja is nearly torqueless at low rpm. This will be most welcome starting up any sort of incline.
MPG potential for the Virago/Vstar 250 is very similar to the Niinja, and may exceed it with your intended use.
Mounting will be a custom job. I like the swingarm mount idea for it's simplicity but do not like the increased unsprung weight, especially with a loaded trailer. The front of the trailer will be essentially unsuspended. A frame mount should probably be mounted very close to the swingarm pivot on each side and then two more locations higher like under the seat. The mount should consider lateral loads.
Google "Motorcycle trailer hitch" and use the Images option to see several examples.
Good luck with your welding job. I love projects that do more with less using conventional ideas unconventionally.
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Good design is simple. Getting there isn't.
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