Wakefield picked up a crucial victory as three first-half tries secured a 19-6 win over Widnes.
The Vikings, who are now five points adrift of the top eight and bottom of the league, saw the damage done in the first-half as Pauli Pauli, Dave Fifita and Tom Johnstone all scored.
Patrick Ah Van to give Widnes hope in the second-half with a try, but a James Batchelor goal and a Jacob Miller field goal secured the win for Trin.
Widnes: Craven, Ah Van, Runciman, Chamberlain, Marsh, Mellor, Heremaia, Chapelhow, Johnstone, Burke, Whitley, Wilde, Cahill. Subs: Leuluai, Olbison, Wellington, Walker.
Wakefield: Jowitt, Jones-Bishop, Tupou, Lyne, Johnstone, Miller, Hampshire, England, Randell, Hirst, Horo, Pauli, Batchelor. Subs: Annakin, Arona, Fifita, Wood.