You can also use the box in a box method: foam insulation on everything, fork removed and fully insulated, then cut one full side out of the first box and double it up on it's opposite side and then zip tie the frame to the doubled panel with all members isolated at least two inches from any side of the box (except the side it's zip-tied to of course) and then zip tie the fork to the frame and slide the entire assembly into a second box that is slightly larger all around. I've received several frames like this with no dunnage whatsoever, just the two box method.