I recently installed LT265/75R16 BFG All Terrain T/A KO2's on my Sprinter. I have zero complaints after testing them on a 2,000 mile round trip to Fan Felipe in Baja California. My second choice was the Cooper Discoverer ST/Maxx, which I ran successfully for 40,000 miles on an Xterra set up for overlanding.
All open void tires will get louder with mileage and age regardless of brand. The more open the voids the louder they will get. The key to keeping the noise to an acceptable level is to rotate conscientiously at no more than 4,500-5,000 miles.
As mentioned above, you should also carry an air gauge, tire deflation tool, and a means for airing back up. My preference is Coyote deflators, but I also carry a spare clip-on air chuck to use as a manual deflator just in case. Although my Sprinter has a hard mounted ExtremeAire compressor, I have used a Viair 400P compressor for many years and highly recommend it.
Viair's 400P is a larger portable compressor kit that is used and approved of by off road enthusiasts worldwide, the 400P can save you when you’re miles from home.
www.viaircorp.com