My issue is that the Empire didn't even put basic mechanical locks on the hatches for their trucks.
Seriously, no locks what so ever, all it takes is a stick to lever it open?
Even modern M1 Abrams have their Ammo Section designed to explode upwards away from the cabin to prevent damage to the crew in a worst case scenario, that's basic good engineering where you can easily design the doors to be the intentional weak point where a detonation would force the explosion upward, blowing the doors off the hinge and busting through any mechanical locking mechanism, thus insuring safety of crew and vehicle.