Yeah, even the products from Icon and King that I saw only replace the front springs/struts (claiming to add a little travel) but left the rear springs alone and just offer shocks to swap out.
I asked Pure Performance about Tahoe products. Until recently they were showing some pretty nice (and quite expensive!) 6" lift products on their web page that advertised longer travel, better ride, etc. including new rear springs. They took a lot off the web page temporarily, but they told me they are working on a 3" lift long(er?) travel system for the Tahoe that includes longer travel progressive springs for the rear. It sounds like exactly what I'm looking for... I'm just scared about the price!
I asked Pure Performance about Tahoe products. Until recently they were showing some pretty nice (and quite expensive!) 6" lift products on their web page that advertised longer travel, better ride, etc. including new rear springs. They took a lot off the web page temporarily, but they told me they are working on a 3" lift long(er?) travel system for the Tahoe that includes longer travel progressive springs for the rear. It sounds like exactly what I'm looking for... I'm just scared about the price!