Cups or Plates??

[SBTork]

I am leaning hard in the direction of installing air ride on my '85 burb come spring time. I've heard some guys say that they will never run lower bag "cups" because they move around and are really not the best idea. I see a board member jliard, I think, makes some lower bag plates that bolt to the LCA. The only drawback to the lower plates that I can see is that you may lose an inch or so of drop over a cup. Are there any other pros/cons to either that I am missing??

Or would I be better off "cupping" my LCA's via 8" pipe? Any pros or cons to that idea?