I started with a 4x4 extended cab truck. Cab is big enough to carry my family. Replaced the stock passenger rated tires with off road capable truck tires with a matching spare. Fill every open place with tools, spare parts and supplies. Under hood second battery, can jump start myself if needed.
Had a cap on the back with sleeping bags and camping gear and a tent but as my family went from 2 to 4 that was a getting kind of small. Now have a popup truck camper, beds, closet, pantry, refrigerator, stove, furnace all ready to go.