The Sightseer would certainly be a strong contender, especially for a Class A gas MH because of its mid-range price point. An easier question to answer "What is the most popular floor plan?" would most likely be the floor plans that repeat year after year. If the floor plan isn't very popular I don't believe it would be offered year after year.
Two popular floor plans in class A gas models have been the Adventurer 32H and Sightseer 33C.
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