As others have said, power loading (i.e. using the boat's motor to "power" up onto the trailer) creates future problems at the boat launches. See graphic below from the Minnesota DNR. Power loading is easier which is why many people do it.
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I keep a set of old water shoes in the bed of my truck. Normally I can load without getting my feet wet, but it's good to know that I can easily do it if needed. Every boat landing is different meaning some are steep, shallow, concrete, mud, gravel, in a current, etc. Each will require a variation of proper loading procedures. It all can be done safely if you properly prepare.
Interesting. Now I see what "power load" is. I have seen a couple people at local lakes that did not back down far enough and then mashed the throttle to ram the boat up on the trailer. I guess that is power load.
My wife and I work as a team to load. I go get trailer and back down and she brings in the boat. I have the trailer about fender deep and she runs the boat to trailer and cuts throttle and raises trim. Boat glides onto trailer and I grab bow and hook it and crank it in. Takes less then a minute to get on trailer. Was taught this method by friends who had decades of experience. Only issue's I have had are when it's very windy and I've have go in the water to straighten the boat and hook it up and pull it on. Of course this wouldn't be possible if you are alone.