Quartzsite snowbirds not here..Update They have arrived.

Starting to load the MH for Monday's drive to Quartzsite. Guess the best place to gas up is in Blythe or the Flying J across the river. I would expect the Chevron in Quartzsite to be very crowded with hours long lines???
Any information on the water and dump trucks that frequent the BLM? Do they just roam and you hail them down to service your MH? We are only good for 3 days tops. 30gallons fresh water with 30 gal black tank and 32 grey water. Yes, we take navy showers and drink bottled water.