Tire went flat in the driveay. Damage?

I had a tire on my TT that would perpetually go low after sitting in the driveway. Not flat but lose 10 lbs if it sat for more than an a month. The trailer is a 2017 so the tires were still in good shape. I took it off and inspected for the usual foreign objects that can cause a leak. No Joy. I figured, well maybe its the bead, so I filled a coleman cooler with soapy water and put most of the tire in and looked for bubbles, which were hard to determine because of the soapy water! No Joy at the bead, valve or tread. By luck, I found the tiniest of pin holes in the casting of the wheel, right behind one of the spokes! That was the leak! I reached out to the vendor that supplied the wheels to the RV manufacturer and they didn't even hesitate to send me a new wheel. SO, if you can't find the leak in the valve or the bead or the tread, KEEP LOOKINGKEEP LOOKING. Best of Luck and Safe travels!