Van's Aircraft RV owners also refer to all metal airplanes from Cessna, Beech, Piper as spam cans as well. On the other hand, the later RV models have been growing in size, for more comfort and baggage. The early 3, 4, and 6 models were airplanes you wore. The 7, 8, 9, and 12 are larger and well refined, while the 10 and 14 are big enough for Bubba and Crisco.