Only lock when away for an overnight. Never had a problem in more than a dozen years and 250k miles.. Know your surroundings and act in accordance with your own level of comfort. I leave my door unlocked too unless leaving the park we are in... I have had my locked up bike stolen from a secure garage with armed guards on site at my condo, but never a problem in any park or coach resort
Larry & Hedy Brachfeld
2003 Double Slide, Detroit 60
Coach # 646
In RV parks we don't worry about keeping them locked. When traveling and parking overnight say in a rest area or truck stop we always make sure things are locked up, with the traffic of people you're better off safe than sorry!
Mike & Amy
2000 Newell Motorcoach Double-Slide
2005 Jeep Liberty 4x4