sadly NOTHING. LA owns you. I'll be duplicating your drive (subsitute Mastiff with Golden Retriever) next Oct.-ish.
i hv zero recs for the drive, as the last "6" times i've done CHI/DTW/NYC <-> LA, i lived on flamin' cheetos+mountain dew & BK.
tho you'll be crossing Las Vegas:
Makino Seafood & Sushi Buffet.
3965 S. Decatur Blvd, Suite 5 (NW Corner of Flamingo & Decatur) 702-889-4477
best sushi buffet in the country, food:dollar ratio. forget the over-franchised todai. makino > * (easy to get to, exit flamingo off s. i-15, make a right, pass RIO hotel, make a right into strip mall after decatur).
and if you can't wait til Cali for In-N-Out, there's one right off I15:
2900 W. Sahara Ave.
Las Vegas, NV 89102
enjoy Los Angeles!