There is something else to check. Vans such as yours are considered more passenger cars than truck. Sometimes they come with comfortable riding passenger tires rather than load carrying light truck tires. The stiffer sidewalls in a light truck tire can take more weight without squirming. Also check your owners manual to see if additional air in the rear tires is recommended for heavy loads. Just before a recent trip across country I was stupid enough to get passenger replacement tires for my Chevy Astro Van because they were cheaper. When it was loaded down, I felt like Iwas driving on slick mud at times when I made a turn. Thankfully adjusting the air pressure in the tires made a huge difference. 36# in the rear and 34# in the front made the difference in my situation. I never thought how different the tires could be with the same exact size and how much 2-4 pounds of air could make. I hope this helps.
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