I have an 89 4.3L S10 Blazer that's sagging a bit in the back. I had a mechanic tell me that the shocks are leaking oil and the leaf springs are probably worn out.

I'm thinking my options are to replace the shocks & leaf springs, or to get some airbags. I'm probably going to just leave the shocks, and replace the leaf springs if I got that route.

What are the pros and cons to these fixes and are there any other recommendations? What are the advantages to air bags?

I generally use it for street travel as well as 1-2x per month 4x4 on fire roads and the occasional effed up fire road. I also pull a trailer from time to time.