Where the body sits in relation to the frame has nothing to do with the suspension.
But these body style trucks only need like a 2.5" body drop to lay rocker right?
if this truck is bd'd 4" it shouldn't have any frame showing.
unless it's a 4x4 with an 8" frame or something i dont see how it could be body dropped
4", lay on the ground with that much room between the ground and rockers and barely tucking any rim.
look at this guys profile, says 24" wheels with a 3" bd.
http://www.streetsource.com/Member_Rides/49102_Firehazarad-2000-Chevy-Silverado.aspx