Trailer looks way short. Put a long straight edge along the bottom and check for hook. If it’s bent that’s a deal breaker for me. Hope not looks like an awesome find otherwise but I’d factor in another trailer.
A spinning prop also causes more drag. This is why long distance sail boaters lock there props when under sail. I think they have a special mechanism to do this. They can't put the motor in gear because the rush of water over the prop would turn the engine over. But...getting back to...