This is a little more as far as explaining the V numbers for the P series. They're the same for the P30 which also has the option of a safety on a couple of the variants.
LINK
The P2000 Trigger Variants:
P2000:
Innovative safety trigger with concealed cocking piece in the hammer and centrally located decocking lever for firing in the DA/SA mode.
P2000 V1:
Innovative safety trigger with concealed cocking piece in the hammer, with a constant trigger pull (Combat Defense Action/LEM trigger of 20 Newtons) from the first shot to the last, without decocking.
P2000 V2:
Like P2000 V1, however LEM/CDA trigger pull 7.3 pounds (32.5 Newtons).
P2000 V3:
Conventional DA/SA trigger and hammer, with decocking.
P2000 V4:
Like P2000 V1, however CDA/LEM trigger pull 6.18 pounds (27.5 Newtons).
P2000 V5:
Double Action only (DAO), trigger pull approximately 7.87 pounds (35 Newtons).