Where have I seen this one in recent memory? The lateral shelf in the back is a giveaway. Only a guess but may be changing hands often. Some funkiness up front with strange mottled coloration and a double row of ?? adjacent to seam. Double hull won't prevent
leaks but will obscure the source. In the plus column no air no
furnace no bath and (possibly) no water heater means less
weight and less to go wrong.
jack