Oil grate and prepare barbecue grill. Cut each sausage link in half crosswise. Grill sausage and vegetables on covered grill over medium-high heat 5 minutes. Turn; continue grilling covered 5 minutes or until sausage is heated through and vegetables are crisp-tender. Brush barbecue sauce over both sides of sausage and vegetables. Arrange rolls, cut sides down, around edges of grill. Continue grilling covered 2 minutes or until rolls are lightly toasted. Cut bell peppers into strips; separate onion slices into rings. Serve sausage and vegetables in rolls.