Try the baking soda and/or vinegar. Lemon will sometimes do the trick. If you think the stinky smell could also be in the drain line, carefully pour some into the drain collector and let it run down. If the trailer has that smell throughout, you might use something like a Glade or similar air freshener. Good old spray Lysol disinfectant is what we used in the doctors office where I worked. Good luck.
Trailerless but still have the spirit
2013 Rockwood Ultra Lite 2604 - new family
2007 Rockwood ROO HTT - new family
2003 Ford F-150
4 doggies - We support Adopt/Rescue.
Sam, you were the best!
Cubbie, Foxy, Biscuit and Lily - all rescues!