RE: LA to Palm Springs
A couple of places to check out if you are poking around...
Farmer Boy's Has a stand on Redlands Blvd. in Loma Linda. See my review of the one near Ontario Airport under the Airport thread. Worth a stop for the onion rings (big thick ones) alone.
DAN The BBQ MAN is on Valley Blvd in Bloomington/Fontana at the intersection of Valley and Cedar. An old Foster freeze stand, it has a couple of tables and his cookers out front on the sidewalk. Ribs and sliced port sandwiches.