Douglas lost 13-9 on the road at an uncompromising Trentham who took advantage of some indifferent refereeing in the South Lancashire/Cheshire Division Two encounter.
Trentham led 7-6 at half-time, with two penalties from Douglas kicking maestro Bryn Snellgrove keeping his side in the hunt.
A further penalty from Snellgrove in the second half gave Douglas a sniff of a win, however, when Laurie Williams and his opposite number were both sin binned, Trentham cashed in quickly and two further penalties gave them the points.
Caomhan Canny hoping for TT return after 2026 withdrawal
Nickolas Ellis impresses at Le Mans
Classic sidecars confirmed for 2026 Southern 100
TT launches sustainability review into Sidecar class
Boxing: Jamie Devine's title fight called off