We know securing a child can present real problems in a medium-duty vehicle like yours. The only place where you can properly secure a child restraint is the center seating position, the place that has the lap belt only. But your vehicle may not have a center seating position. Or, even if you have one, you may find that the child restraint keeps you from operating the shift lever or other controls. The only answer may be to have the smaller children make the trip in another vehicle, where they can get the protection they need.
You will be using the lap belt. Be sure to follow the instructions that came with the child restraint. Secure the child in the child restraint when and as the instructions say. But do not use this position if the child restraint interferes with shifting gears.
There are no top tether anchors in this vehicle. Do not secure a child seat in this vehicle if a national or local law requires that the top tether be anchored, or if the instructions that come with the restraint say that the top tether must be anchored. See Lower Anchors and Tethers for Children (LATCH) if the child restraint has one.
In Canada, the law requires that forward-facing child restraints have a top tether, and that the tether be attached.
Make sure the release button is positioned so you would be able to unbuckle the safety belt quickly if necessary.
To remove the child restraint, unbuckle the vehicle's safety belt.