We also use 4 WD vans for trips to the countryside.
Few years ago we used only Russian UAZ Furgon van, which is available for 7 /maximum/ passengers, except driver and their luggage. However the vehicle is very suitable for Mongolian rough roads, it is very noisy, does not have air conditioner, hard for passengers and sometimes dusty. Now, we use the Furgon for just special tours, which has to cross very rough road and also for just luggage and picnic kitchen. It uses 16-18 l petrol for 100 kms.
In past years, we are commonly using Japanese Delica van for trips. Its capacity to cross rough road is worse than Furgon. But, we are using it because countryside roads in many parts of Mongolia are getting better. Delica is for 5 /maximum/ passengers, except driver and it has small space for luggage. But, there is air conditioner in Delica and it is soft for passengers and no dusty. Not available speed driving through off-road and uses 15-17 l petrol for 100 kms.