Hwy 58 from Bakersfield, CA is good. You could then pick up I-40 to Hwy 95 toward Lake Havasu City, AZ. Take Hwy 95 to Parker, AZ and on to Quartzsite, AZ. Then pick up I-10 east. At Phoenix we prefer to pick up the north 202 which ends at Apache Junction on the far east side of Mesa. It avoids a lot of traffic of Hwy 60. We've taken the above-mentioned roads often with our 40' motorhome. They are good.
Full-Timed for 16 Years
.... Back in S&B Again
Traveled 8 yr in a 40' 2004 Newmar Dutch Star Motorhome
& 8 yr in a 33' Travel Supreme 5th Wheel