Anytime I park any trailer whether a camper or a utility trailer or garden cart, I pitch it so water runs out/off of it. Just good practice.
While camping I pitch the trailer to the rear drivers side corner to keep the runoff away from our living area.
2006 23B Hybrid with 10k round bar WDH
2011 F150 4x4 SCREW Ecoboost, Max Tow, Integrated TBC, 3.73 LS axle, Firestone Ride Rite airbags.