I think he was referring to clearing parking lots with the mention of the trailer and skid steer and that a 4x2 wouldn't pull the payload.
I am not licensed by odot but have helped many people every time we have a bad storm. OCPD will usually run lights for me depending on the location, and I have never taken a dime from anyone. Took a few phone numbers, but I just always enjoyed helping out. I also made sure to use the proper equipment: tow strap rated well beyond the payloads I would handle, shackles, and proper attachment hardware for every make and model. During the really bad snow and ice tow truck drivers have turned down helping people do to being to busy or not willing to make the pull for safety reasons. I once pulled a car that slide off of 44 junction right by the western heritage museum and was stuck clear down at the bottom of the bar ditch. Tow truck driver said he wouldn't do it. I drove down into the ditch and pulled the guy all the way around the museum and onto 63rd street to get him home, free o charge and no damage done.
If a wrecker driver refused a recovery, it was most likely because he judged it to be unsafe given the current conditions. Sometimes that car in the ditch needs to stay there until the roads clear up. While I'm glad that you didn't damage the casualty that time, what financial responsibility do you carry in the event that your "recovery" does damage the car or cause a secondary accident?
In 2009, we ran a support vehicle (4x4 Expedition with FULL insurance just like the wreckers) to give people a ride home when we were too busy or it was too dangerous to do the recovery right then. Got them home, didn't charge for this, then recovered the car in the middle of the night when there was little to no traffic and visibility was better and delivered the car to their house.