Four passengers do not automatically mean an SUV is enough
Families often choose by headcount first and assume an SUV should be fine for four people. On a Xinjiang road trip, however, luggage volume and child equipment often consume the space before the passenger count does. Four large hard-shell cases already push many SUV boots close to their practical limit. Add a stroller and the load can start affecting visibility, safety or cabin comfort.
You need to judge three types of space, not only the boot
The first is enclosed luggage space: can the cases and stroller fit without blocking the rear view or forcing unstable stacking? The second is real seating space, especially in the second row where an adult may need to care for the child and reach supplies. The third is quick-access cabin space for tissues, spare clothes, snacks and small essentials. MPVs usually balance all three better.
The MPV advantage often becomes obvious after several days
On a short transfer, an SUV may seem workable. The difference becomes clearer once the trip includes repeated loading, unloading and family care over several days. Sliding doors, a lower step-in height and a wider second row make daily travel easier. Comfort is rarely decided in the first hour alone. It shows up by the third or fourth day.
If you still prefer an SUV, the luggage plan must shrink first
An SUV is not impossible for every four-person family group, but it usually requires fewer rigid large cases, a more compact stroller and a stricter layered packing system. In other words, if you want to keep the SUV, you often have to reduce bulk before departure. If you want the simpler day-to-day experience, the MPV is often the safer bet.