To assure a minimal expense journey you must think about areas to stop along the route to and from California or Arizona. You should plan your route ahead of time and locate rest stops and truck stops along the route that could be used as overnight resting areas. Some of these provide water and sewage disposal stations although the most northerly ones, in winter, sometimes have these provisions turned off due to freezing.

The following information was accumulated on the routes that I have traveled to and from British Columbia to these boondocking areas.
 
 

Vancouver BC to Oregon Border via I-5 Okanagan Valley BC to Oregon Border & I-84 via Highways 97, State 28, State 281, I-90, I-82 (WA) Washington to Oregon Border via I-82, I-84 junction, West to I-5 (OR) Portland OR to Bakersfield CA via 1 & 3 (I-5 south) To Quartzsite AZ via Hwys, State 58 through Bakersfield to Barstow, I-15 to Victorville, State 18, 247 and 62 to Palm Springs and I-10 South From Oregon Border Junction I-82, I-84 East, using Hwys I-84 (OR & ID)  to Exit 172 I-84 (ID) South on State 93 (ID & NV), I-15 (NV), to Junction State 93 & I-15 NV West on I-84 (ID) (UT), I-15, I-515 (UT) to Junction I-15 and US 93 (NV) To Quartzsite AZ from Junction State 93 and I-15 via US 95, State 163 (NV) and State 95 (AZ)