After visiting the aita site we measured our 3000Rk. I was concerned because we added 3 Maxx air vents each of which were 11" tall not to mention two straddling the highest point. We came in at 13' even. I concluded that the 12' 9" listed in the book was with the front A/C. Just MHO.
Bill
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Bill and Lisa Rearick
2023 Grand Design Reflection 367BHS
2020 GMC SIERRA 2500 Denali, 8 ft bed, SRW, Duramax Diesel w/10 speed Alison Transmission.
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