[dancam]

What surprises me the most is the benefits from the wheel alignments and aero mudflaps.
Can you post a link to the site where they sell the mudflaps? I thought they would cost way more. Thats pretty cheap even just for installing them.
Once you start on this i really hope you can post test data. Are you doing all modifications at once or trying just mudflaps on 2 trucks, just airtabs on 2 trucks... and so on to verify the data before you do it to the whole fleet?
Something like relocating the air horns and exhaust looks like it needs to be tested before being done as it looks like its a close call to weather or not its worth doing.