Yeah from what I can tell the difference is more aesthetic/convenience/luxury stuff than actual mechanical differences under the hood or underneath.
Still, as many people that are running Bilstein's I can't believe they don't make them for the 2010 SLT? Probably a different topic/thread, but no need to create yet another one for that. If the Bilstein's are not an option I'll probably just go 4" Rancho/ProComp lift. That being said, I'd rather do $500 in shocks than 2K in lift. Probably just email one of the vendors here and inquire about that.
I mean how much difference in suspension could there be between the different trims? Between the SRT and an Express? Sure, I could see a difference there, but between like the SLT and say an ST or Outdoorsman? Couldn't be that much difference....but I don't build them, I just drive em.