The base of the winch is threaded (M8x1.25 IIRC) so i just got some appropriate length bolts and countersunk the 2x6 so it would mount flush to the wall. I used washers in my countersunk holes. This does mean you have to mount the winch to your wood and then mount the wood to the wall/ceiling, yes it's heavy, yes it's a bitch, yes OSHA would not have approved. #safteythird I stuck it to the wall with regular old wood screws so I could install the lag bolts after.
Lag bolts with washers for securing the 2x6 to the wall. Make sure to pre drill the stud and offset them so it does not split the stud, or joist in your case. I basically echoed the directions used when installing my TV mount(s).
http://www.kaiserstructural.com/how-to- ... lag-screw/