In a large bowl, combine the meat, zucchini , summer squash, onion, peppers,tomatoes, mushrooms and dressing or marinade; toss to coat.
Slide on the skewer in any order combination the meat and veggies and place them on the grilling pan.
Grill on medium-high for 10-15 minutes, or until the meat is cooked through when checked with a digital read thermometer.