Jeff, I feel for you. This is something I could easily do.
If you have two fuses in the line check the one you said checked out OK. Replace both of them with new ones and then give it a try.
Is there any sound from the motor at all? If there is then perhaps a shear pin or something similar might be broken.
Reversing the polarity, reverses the direction the motor will turn. Reversing the polarity has no effect on the lights, they will work either way.
Keep us posted here when you find the solution. Best wishes.
2017 Toyota Tundra, Double Cab, 5.7L V8
2006 Airstream 25 FB SE
Equalizer Hitch