I’ve driven my old Avalanche coast to coast many times. It has a ton of room interior, back seat, bed, and roof racks. You can put the mid gate down for more room or if you want to lay down to sleep. Plenty of power (V8), not bad on gas and 4x4. Cheap and easy to repair and maintain. Tahoe / suburban would be just as good if not better. I also drove coast to coast in my old Pontiac vibe / Toyota matrix and it has a ton of room for its size, but I did it solo. Would be super tight w 2 people and gear.