Normally if the valve stems are rotten then the tires are not far behind. Actually it is normall the other way around, this is why valve stems should be replaced when the tires are replaced  . I have never actually seen a bunch of valve stems go bad in all the years i have wrenched on cars. Once in a blue moon maybe a valve stem goes bad but never a couple or more on the same vehicle.
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06 Chevy D-Max ECSB, 8' Fisher plow, 6' Salty Dogg in bed sander,
06 Chevy D-Max RCLB, 8' Fisher plow, 98 Sumitomo mini excavator, 96 7k 16' Phoenix car trailer, 06 12K 18' Cam-Superline equipment trailer
04 7k 6'X10' Kristi dump trailer, 07 7k 7X14 Continental V-nose enclosed trailer
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