55.2-59 air ride compressor question

[slammed57]

Iam looking for locations to mount my compressors . I am thinking about running the under the truck on the out side rails.... my concerns will be while driving in the rain at times the compressors filters getting saturated with water and causing issues with the compressors or pulling moisture into the tank.... for those of you that have compressors under the truck do you have any issues with doing so or any other advise i would really appreciated it