Medium vehicles up to 3.5t - popular size for 2 people traveling the world
4 door vehicles (or 2 door vans like the Toyota 79 Troop Carrier) with a ground or roof top tent or even better with a pop-top roof conversion are very popular overland vehicle options with world travelers because they are compact enough to tackle just about any trail when properly set up, yet they are big enough to allow for enough creature comfort to make extended travel enjoyable. Especially vehicles with a pop-top roof conversion offer the luxury of spending a couple of days inside in reasonable comfort while the storm clears outside.
Examples: 70/80/100/200/300 Series Landcruiser, Landrover Defender 109/110/130, 4 door Jeep Wrangler, 4 door Ford Bronco, Mercedes G Wagon, Ineos Grenadier, Mitsubishi Delica Van, Toyota Hiace, Volkswagen Vanagon
The venerable Toyota Landcruiser 70 Series - the base vehicle for countless expedition builds
The Land Rover Defender 130 is another common choice as a base vehicle for expedition builds.