We have a Ford S350 and need to buy a jack for potentially changing a tire. I don't know enough to do maintenance myself, so it isn't for working under the van, just for the emergency tire change. I selected one with a 5000lbs max, and the spouse thinks that may not be heavy duty enough. My thought is that at least two tires will be on the ground, so it doesn't have to hold the full weight. His thought is that the van weighs more than that. Which of us is correct? If he is, where do you find a jack with a higher weight rating?