Thanks for the info. Just to make sure I understand, the 610 number not only refers to the sleeper length, but also the height? For example, I won't see a 770 flat top because all 770s are condos? How tall are a 610, 660, and 770? Also, given the closeness in size to the 420, 610, 660, and 770, I'm thinking that the 430, 630, 670, and 780 are maybe newer versions? Anybody know what model year the chage took place?
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