Check the swing keel operation and the mast support area. If the sails are good and the trailer is fair then the price is very reasonable. If you are intending to traverse the Mississippi River I would suggest you purchase a good outboard motor in the 5HP range for that boat. There is a lot of traffic in the river that you will need to get away from and a small trolling motor is not going to do it as they lack the power to push against wind and currents. I would strongly suggest that you do your homework about the power consumption of the electric motor and the variables for sizing and installing an adequate solar panel and a battery array.