Borg Dually Valves are a great way to go. I've used them on two sprinter RV's with no problems. For your interstate the part number is: DL1SPAL (you only need the rears). Purchase them at: yourtireshopsupply.com. Then have them installed at a competent tire shop that agrees to follow the included instructions. As a sidenote, while you're having them installed, have your front wheels balanced as well as the rears. Seems like many Sprinters are shipped with out of balance wheels. Good Luck!
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