Matt, i completely agree with out on everything you said...i took my front wheel well liners off yesterday and found the bottom of the fenders filled with crap...and saw the spacers you are talking about...also saw the sponge fabric sound deadners hiding there behind the antenna motor...just terrible!
Ill have to find the rear holes you are talkin about! see if i can do some drilling mods to get that area safely drained
1997 MN12 Sport 4.6L Supercharged 5 Speed Sold
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2008 Yukon Denali 6.2L Supercharged