Best 2 off the shelf ride are BDS or TUFF COUNTRY.
4 inch AND 35 inch tires is good .
Blazer @ 4inch lift kit should have a c/v drive shaft at rear and set pinion angle .
Suburban should be fine .
Bilstien shocks are the HOT ticket for ride quality .
www.offroaddesign.com has TONS of quality parts and custom leaf spring packs if you want the best .