Marinade the chicken thighs in a mixture of 1 cup dill pickle juice and 1 cup milk for at least 30 minutes, but not more than a few hours.
When you're ready to cook the chicken, heat 1-2 cups oil in a deep pot over medium-high heat.
While the oil is heating up, drain the milk/pickle juice off the chicken.
In a separate bowl, whisk together the remaining 1 cup milk and 2 eggs.
Pour the milk/egg mixture over the chicken and make sure all of the chicken is coated.
Place the flour, salt, pepper, and sugar in a large ziptop bag and mix it around.
Pick up a piece of chicken and let the milk/egg drip off, then place the chicken piece in the bag. You can do 2-3 pieces of chicken at a time.
Close the bag and move it around so all the chicken pieces are coated.
Using tongs, place each piece of chicken in the hot oil.
Use a meat thermometer to ensure the chicken is cooked! You'll cook each piece for about 5-7 minutes on each side. If the breading is getting brown too fast, turn the heat down a bit.
Place the cooked chicken on a paper-towel lined plate. Continue the process until all the chicken is cooked.
Serve on buns with lettuce, tomatoes, pickles, and cheese!