Abstract: A door operator having a fluid drive motor and a manual override. The bidirectional hydraulic motor connects to a drive shaft through a power train including a shiftable --quill--type manual clutch mechanism which allows an alternate connection of the drive shaft to a manually-operated wheel. When the cable which shifts the clutch for manual drive is pulled, a switch disables the control for the hydraulic motor. When the motor is not provided with pressured fluid from the pump a hydraulic brake engages the motor.

Abstract: A detachable trailer for transporting heavy equipment and the like includes a forward tongue adapted for hitching to a towing vehicle and a support assembly for supporting the tongue on the ground at an elevation desired for hitching. The support assembly includes a screw type stand which is supported from a tongue-mounted bracket for pivotal movement between a lowered or support position wherein the stand base can be lowered into engagement with the ground and a raised or stowed position for over-the-road travel. A locking pin carried by the stand is releasably biased into engagement with angularly space apertures in the bracket to releasably retain the stand in the support and stowed positions.