I, as well, for for a large service that puts BLS providers in vans, ALS in boxes, although I work PB and when our usual truck is in the shop, we end up in a van fairly often.
Vans with BLS loading really do accommodate all the equipment quite well. We keep 2-3 LSBs/Scoops under the bench without trouble (accessible only with the doors open). Stairchair goes on driver's side near the patient's feet.
With an ALS/CCT configuration, our drugs, pedi, vent/cpap, pump, suction and backup jump kit replace the BLS jump kits and AED near the side door shelves. The larger jump kit either lives on the bench (near the main O2) or on the stretcher (with the LP12, which moves to behind the patient's head or side rail during transport).
Generally, all the equipment previously mentioned fits in a BLS truck, it seems, with the exception of the Lucus, which I presume could be placed under the bench seat or behind the airway seat. In fact, a Lucus/AutoPulse/Geezer Squeezer is more important in a van, because of the lack of CPR seat/room for additional personnel just for compressions. A monitor charger/harness does fit on the shelf near the airway seat. I'm not familiar with the Stryker power stretcher, but I do know a powered Ferno fits in a van without difficulty.
Long story short, BLS has no trouble fitting, and ALS can make it work, even CCT is possible.