I just had one built....pole barn style...roof only....our 2017 305RL is listed as 35'8"...so I did it 38 foot long....18 foot wide.....the camper barely fits under roof.....thought I was getting a foot on either end...wrong....like Scottz said...as big as you can...then add a couple feet
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Brian & Pam
2017 305RL High Country
2005 F-350 Lariat
6.0 Power Stroke Diesel
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