More on van safety-
A few things to note on conversion vans-
Carseats and boosters must be used in front-facing vehicle seats. Side and rear-facing vehicle seats are not acceptable for kids in carseats.
Kids in boosters require a lap AND shoulder belt. Taller kids and adults will need adequate head restraints not provided on some vehicle seats.
Conversion vans are built on truck platforms. As such, they share aspects with large trucks, full size vans and SUVs. That includes handling, braking, rollover risk and frames that don't crush in crashes. Be sure to take a good, extended test drive of a similar van, as they do not drive like cars or even a minivan..
Custom conversion vans are a reasonable choice, just be sure to know the tradeoffs before you buy one, and not after
Darren