Sheet Pan Sausage and Pepper Hoagies

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6 hoagie or sub rolls

3 bell peppers (red, yellow and/or orange), seeded and cut into large chunks 

2 red onions, trimmed and cut into quarters 

3 tablespoons olive oil 

1 teaspoon dried sage 

1 teaspoon kosher salt 

Freshly ground black pepper

12 Italian sausages (hot and/or sweet) 

1/2 cup mayonnaise 

1/3 cup ketchup 

1/4 cup whole-grain mustard