Pickup trucks, esp 4 WD and jeeps. Duallies probably less likely as they stand out. I removed the 4x4 stickers off my chev, it is low enough it looks like a 2WD. I will be installing an anti hijack device this summer. It will cause it to die about 3 min later. If I get hijacked i will tell them they don't want it, it has lots of mechanical issues, so maybe it won't surprise them when it does. Regardless, I stick to toll highways and a set route these days and try to travel with others.