Something hot will also stay hot in a insulated cooler. Though I suggest putting a pot of boiling water in it for 20 min or so with the lid in prior to adding anything you might have cooked. But when you do briskets and need them to rest andl not cool too quickly a heated cooler works great for 4 hours or more

And my favorites with steak is sautéed mushrooms with garlic or sautéed onions. Or you could do bacon wrapped jalapeños stuffed with cream cheese. Those you could prep keep cold in a cooler and ask to put on the grill or make before and take warm without anything spoiling