How many pounds of torque are recommended to tighten lug nuts on a boat trailer with aluminum wheels?

Thanks

100lbs

depends on the size of the stud...100 lbs too much for 7/16 or 1/2 studs but ok for 9/16. likewise too much for 12mm but ok for 14mm. google it...

Mine are 1/2 and sticker says 100lbs

ok, go with the sticker...
i do aftermarket wheel and tire installs all the time at my family's speed shop and there is a sheet with torque values for certain size studs. 1/2 studs say 75-85 ft./lbs. your trailer probably comes with a stronger alloy stud than vechicles. always go with manufacturer specs