Gas leak on Atwood 8531-I’ve dclp

Might consider taking the RV into commercial propane dealer - have them fill your tank and ask them to check for leaks. In my area they would find/fix leaks for free.

Water heater above but don’t detect any gas there.

The bubbles will be very small? Is the solution very soapy?
Is there other propane items close by? Expand your search!

Don’t see bubbles but detect gas in that area.

Yes, it is possible it can leak on the tank side. Use soapy water mixtur to locate. Watch for bubbles!