Congrats, but you don’t really need a Northern Lite owner. :)
I use a 2 1/2 extension because my truck came with a 2 1/2 inch hitch. I have a 9 1/2 TC, so I only needed a 18 inch extension. It’s important to not go any longer than you have to because it puts more stress on the hitch. I think you can likely get by with a 24 inch extension.
People who tow heavy usually use a more heavy duty hitch like a Torklift Superhitch. Towing a motorcycle probably doesn’t count as a heavy tow even with a Harley in it.
