I have a 2017 Yamaha VK540 and it is a 2 stroke, fan cooled, and gets about 150 miles to a tank. I pulled a bunch of gear when I did the 170 mile winter multi-sport expedition as the instructor for UAA, twice so for. It is not too top heavy, a comfortable ride, has a low gear and reverse. Go check them out in Wasilla.

This course at UAA is what I used to develop a lot of the logistics for the serum run trip and has proved to be very valuable.