Hi all,
I'm looking into this too. It appears each woman responds differently to the medical cocktail in the mobile epidural, so there are no guarantees (as with all meds), but there are some anaesthetists in SA who can do it (I'm getting info from a lady in my church who found one and had this for her 3rd pregnancy, in JHB). I'll keep you posted on any details I get.
Some midwives tell you you won't be able to walk, just maybe pull your legs up into a sitting squat. That all depends though on dosage and personal response. I found a great website on epidurals in general, and a fascinating journal article on mobile epidurals done in low resource facilities that had great pain relief and excellent mobility (where they don't have enough nurses to stay with patients all the time). Take a look, and do share any other info you get too, this option really does seem the best of both worlds.
reference.sabinet.co.za/document/EJC167486 (if only the abstract appears you can download the full article using the button on the right margin, it's free and not very long)
www.allaboutepidural.com