Egypt is an extremely bureaucratic state, immigration with a vehicle time consumig and expensive with carnet (150-200 €) and visa beforehand in Germany between 40 and 80 €/Pax , road tax and Diesel permit plus Arabic number plates about 1000 € for 3 months. Customs lax, friendly, educated people, police and officials.
Immigration/Emigration via Raffah/Israel is not always possible and costs about half a day if papers in order. Travelling into the South under military protection, no fees, into the Western Desert/Siwa/Dakhla/Gilf Kebir currently not permitted. Police presence high, quite restrictive.