What I'm saying is, the customer rents the entire truck, the advertised load capacity of the truck, regardless of how much or how little they decide to ship, and number of skids or the weight doesn't matter, as long as it will fit into the truck's dimension and weight limits. With general freight and LTL, freight is usually booked by the pound, and 2 or 3 skids will pay more than 1 skid because of the additional weight of the second skid or third. That's generally not the case with expedited, where the truck gets rented based on dimensions and weight limit rather than by the pound.
For example, I've had a few occasions where I'm at a shipper picking up a single skid going to some location, and I notice they have second skid sitting there labeled for the same location. They were going to send that skid by a second van. I've asked them if they want me to go ahead and take it. They've asked how much more will it cost, and I've told them that since it'll fit and as long as the two skids don't weigh more than a certain amount, then the cost for one or two would be the same since they are renting the load capacity of my van rather than sending the freight by the pound or by the number of skids. I run into that about 6-8 times a year, actually. Happened just a few weeks ago, out west, where I was dispatched to pick up one piece, 200 pounds, and at the shipper they were commenting that they were having trouble finding a second cargo van to haul the other two skids. Well, the skids were 36 x 36 inches, which fits exactly into my 108 cargo length. I told them that I could fit all 3 skids in there with no problem, since the total weight was within my limits, and that the cost was the same for one or all three. They were happy.