The popular "3-3-3 rule" for RVers and road trippers is a helpful pacing guideline designed to prevent travel fatigue and ensure a pleasant journey. It recommends driving no more than 300 miles in a single day, arriving at your campsite by 3:00 PM (leaving ample daylight to set up camp and troubleshoot hookups), and staying at least 3 nights in each location to relax and explore the surrounding area rather than constantly packing up.