I did a stupid last year. Thought i smelled propane when we stopped in Tucumcari after driving 600 miles. I could only smell it outside and at the rear of the trailer where there are no propane lines or anything so passed it off as maybe not propane or not our trailer. Stove and heater worked fine that night and didnt smell in the morning. Next day we head to Needles, Ca and our fuel stop was in Flagstaff where I smelled it again but this time at the front. I removed the tank cover and didnt see anything that looked loose or notice hissing or anything. We fueled up and headed to Needles and when we arrived I could smell it again. I knew there was no way we did not have a leak so took a big bottle of windex and laid under the trailer and found a fractured flare fitting right next to the leaf spring hangar. It was a copper flare where it joined a steel pipe heading to the to tongue. I figured somwhere before Tucumcari some road debris must of hit the pipe or the manufacture way over tightened it and it finally failed. Cost me at least 15 gallons of propane and had to drive home from Needles to San Diego with the genny running to keep the food cold/frozen.
Anyway if you smell propane you have a issue!