I moved this to the 4x4 forum so hopefully you will get more replies.
As for the 1 ton from and offroad issues, they are stronger than the 1/2-3/4 frames, but you still might have the normal steering section frame crack.  As for being good offroad, it depends on your intentions.  The 81 1 ton should have the good axles.  As for lift, there are several proven companies, and I don't think you could realistically chose a bad one. 
What kind of offroading are you focused on?
How much lift are you wanting?
Give us a general idea of you future plans. 
Chris Lucas
www.73-87chevytrucks.com
www.captkaoscustoms.com
Project Su
Jimmy 2WD Project