There should be 3 speeds of entering/exiting the vehicle:
- fast - when soldier is equipped with a pistol (no primary weapon)
- medium - when soldier is quipped with a weapon with a foldable stock (like MP40 or M2 Carbine)
- slow - when soldier is equipped with other weapons
It won’t make big difference now but if mechanised/motorised infantry was introduced, it would be a thing to consider when equipping soldiers.