Thanks everyone, your input has been very helpful!
Jeff, thanks for that added input. You're saying that I can keep the surcharge load "80psf", as Fndn had mentioned, out of the sliding analysis.
Limiting cases?
I'm designing a 4'tall, 8" cmu retaining wall to provide support to a private residential driveway adjacent to it. I'm am looking at applying the AASHTO 250psf surcharge since the driveway might be called upon to host the occasional fire truck, concrete truck...
Since this is only an occasional...