Chaining up all 4 tires is overkill on most highways. For starters, I'm not sure MB approves of chains up front. It works great of true 4x4 systems, but typically AWD systems (which the Sprinter is regardless of marketing), you only want to chain up the primary drive axle to avoid overheating the power transfer unit. There may also be clearance issues.
Legally you only need to chain up the primary drive axle when chains are required, plus a trailer axle if you're towing. That said.... chaining up all 4s is pretty nice in freezing rain, if your drivetrain allows for it.
2000 E450 dually V10 wagon