[lofly'a]

drop-ins do slip a lot but, i had one in my 92 gmc for 10 years and not a speck of rust underneath. i did however apply some inexpensive body side moulding to the underside ribs of the liner before installing it.
spray on liners hold up great to abrasion, but won't stop dents as drop-ins will, and in my part of the country, (hot and humid) they chalk up real bad after a couple years.
the key to a good drop-in that i've found is to find one that won't let water in from the top, and i'm not talking about an over the rail liner either, cuz i think they are ugly and only good for work trucks. if any of you have a drop-in and hate the sliding out back, add some hooks to bind your load ( i took my liner out and put retractable hooks at the bottom cuz top hooks do little good), or use the recesses in the liner and install a 2x4 to hold load, or buy a mesh basket available everwhere to hold your cargo.

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keep fly'in lo
66 gto ragtop 389/400
72 blazer (wuza4by)
68 swb fleet 350/700
98 tahoe 2dr (daily ride)