Slow Cooker Pickled Pulled Pork Sandwiches

Name: Slow Cooker Pickled Pulled Pork Sandwiches
Ingredients: 1 (5-6 lb.) boneless pork shoulder; 1 (20 ounce) jar pepperoncini’s with juices; 1 (16 ounce) jar pickled okra with juices; 1 (16 ounce) jar pickled mixed vegetables with juices; 1 (8 ounce) jar pickled banana peppers with juices; 1 cup pickled jalapenos, optional; 12 ounces beer/lager of choice; 1/2 yellow onion, thinly sliced; 3 garlic cloves, roughly chopped; 3 sprigs fresh thyme; salt and pepper to taste; 14-18 slices thick cut white bread, lightly toasted; 2/3 cup mayonnaise, divided