OK, so I just bought a used stern drive boat (21' Citation). I got to use the slip at the Marine the day I bought it, then they helped me pull it up onto the trailer at the end of the day. The next day I launched at a public ramp and everything went well until I tried to come back in. I brought the boat close to shore and killed the motor, I jumped out and got the truck while my GF kept the boat off to the side (not running). I backed in the trailer and then hopped in the boat and pulled it onto the trailer. I powered it up and winched in the last 2ft. or so. I then pulled out the truck and when I was installing the transcom tiedowns noticed the brand new prop was ground down quite a bit!! What the heck did I do wrong? I didn't hear anything abnormal? Would I even know? Anybody with tips on launching/recovering a i/o in shallow water?