Parts: any vender at glamis but best prices At Krazy Kevin's. major repairs most likely out of that area and shops that I know Rub Dubs Racing & Tripones Racing which those are 1.5 hrs away.
Gas: hwy 86 in Salton city am/on or red earth casino not sure where in Brawley
Registration: get a visitor pass online or chaparall motorsports
Wood: also good deals in salton city off hwy 86
Ask more of us Local guys for help that know the area better. My group is in glamis at least a couple times a month since its only a 2hr drive.
Also an enclosed trailer will help for more than just shelter can also be used to make repairs out of the sand.