Possible Clues:

• Survival skills of husband trapped between vehicle and boat
• Skills needed to survive in a natural environment
• Oz skill?
• Skill(s) attained while living in uncultivated country
• Skills required for wilderness survival
• Backwoodsman uses this road and sea transport, stabling horse
• Wild survival technique requires two conveyances, including horse
• Companion returning by vehicle and crude boat shows survival skills
• Survival skill required on presidential yacht?
• What's needed to travel in the wild: vehicle, horse, and boat