Winch. Insurance in case you get stuck while exploring by yourself. No other mod I have done (on previous vehicles too) has allowed me to explore more places, all because I'm willing to take the risk of getting stuck because I can (almost) always get out.
I used cbi's hidden winch mount and smittybilt's 10k h2o winch. Will set you back about $850 and an afternoon installing.
I used cbi's hidden winch mount and smittybilt's 10k h2o winch. Will set you back about $850 and an afternoon installing.