And, in all honesty, I'm trying to come up with reasons why getting in a 1.5 tonne truck with the child would be easier than getting in the var and driving somewhere ... and coming up blank.
We had one of those vans and used it all the time, they are not that huge, just nice and high. For us it was easier due to the driveway set up, the business paid for the petrol and I was not driving back then. I spoke to DH about this one as an ex transit driver and a driver of heavy ridged trucks (12 pallet etc). The main concern is the kid going through the windscreen, due to the height and weight of the vehicle you would just drive over a car in an accident. I asked him would he put DD in a van or a truck and he said yes so long we had a proper restraint installed. So in the case of a booster one with an anti submarine clip is very important.

Would I feel comfortable with DD in a transit or a truck? Only if it was necessary (I had the car and he had to pick her up) and she was properly restrained.