I am not sure there is any REAL logic to it...the 350XL has 3 slides and only has one furnace, the 352 has 4 slides and 2 furnaces, the two coaches are nearly identical with the exception of the Residential fridge in the 350, and extra slide and floor space in the front area when fully extended.
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2014 Georgetown XL 352QS
2013-2019 Days Camped-502
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