Possible Clues:

• Things towed along towpaths
• Long boats on inland waterways
• Enters unannounced, with "in"
• Boats for inland waterways
• Shoves spades onto boat
• Frequent Great Lakes travelers
• Moves clumsily, say, rolling around in drinking houses
• Freight carriers
• Flat-bottomed garbage boats
• Enters aggressively, with "in"