I've been chasing this truck around Vegas for the past three months and I finally tracked it down at a comic book festival over at Flamingo. I tried a variety of meats (so I wouldn't have to do it again) and these are my findings:
-The beef brisket was tough and disappointing (it was cold)
-The spare rib was tender, but fatty
-The crème de la crap was the pulled pork -- tender and soft and yummy
For future reference (since it's not listed anywhere), here is their basic menu:
Smoked Pulled Pork Sandwich...$7
Smoked Brisket Sandwich...$8
Smoked Hot Link Sandwich...$5
Smoked Salmon BLT Sandwich...$10
Smoked Ribs...3 bones/$7, 1/2 rack/$12, full rack/$22
Fresh Cut Fries...Individual/$3, With Sandwich/$2 (not available the day I went)
Smothered Greens...$3
So yeah, it's limited and the prices are kind of high. I'd go again if I ever saw the truck, but I'm not planning on chasing it down again anytime soon.