Missing several starters through injury, the undermanned ARKS were overrun by the hosts in the second half, conceding 22 unanswered points.
The result saw them slip to sixth on the ladder, although still within striking distance of a top four spot and a semifinal berth.
Despite having the first use of the wind, ARKS found the Rockingham side adapted well to the tricky conditions, with their forwards doing most of the damage as Adam Brick and Ricky Hayes both crossed for tries.
Get in front of tomorrow's news for FREE
Journalism for the curious Australian across politics, business, culture and opinion.
READ NOWPassing errors in the strong wind again brought ARKS undone with scoring opportunities lost through dropped balls and errant kicks.
To compound their misery, Same Hira was stretchered off with a knee injury as the first half finished 19-5 after Cody Chapman-Bentley grabbed a consolation try.
Rockingham started the second half using the wind to gain territory and then were able to pressure ARKS, constantly adding to their score.
A flood of second tries overwhelmed the under-manned ARKS, who fought bravely but ran out of steam in the second half.
Earlier, ARKS’ B-Grade side went down 28-17 to Rockingham, also hindered by absentees and injuries.
Five injuries in the opening 15 minutes added to ARKS’ agony, as they found themselves down 21-5 at half-time.
A spirited second-half effort wore Rockingham down, as Mike Wallcott commenced the attempted comeback with a well-worked try.
But they were unable to overcome the large deficit as they ran out of legs late.
ARKS’ Under-20s side again fought hard, but suffered another heavy loss to a red-hot Palmyra outfit.
MORE: Uber driver charged with indecently assaulting female passenger
MORE: Joondalup Mayor Troy Pickard declares intention to stand for re-election
MORE: Teen left with broken wrist following dangerous brick attack in Mandurah
MORE: Police lay charges after residential fire in East Victoria Park