The only way for a roof rack to beat a trailer, would be to remove all traces of the rack when not loaded for 0 penalty when not in use,same as removing the trailer when not in use. What is the CdA penalty for a rack and kayak mount system? Probably much higher than the trailer witch only effects the Cd and not the A.
What kind of value$ do you place on your time ? Bill out the rack mount /dismount time at your hourly wage. This will give a cleaner picture of the total cost difference. The more you paddle the faster the cost of a trailer is absorbed as it can be setup for hook and book (10min from the completion of the decision to go paddle to the time you pull out the driveway for a trailer)
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1st gen cummins 91.5 dodge d250 ,HX35W/12/6 QSV
ehxsost manafulld wrap, Aero Tonto
best tank: distance 649gps mi 24.04 mpg 27.011usg
Best mpg : 31.32mpg 100mi 3.193 USG 5/2/20
Former
'83 GMC S-15 Jimmy 2door 2wd O/D auto 3.73R&P
'79 Chevy K20 4X4 350ci 400hp msd custom th400 /np205. 7.5-new 14mpg modded befor modding was a thing
87' Hyundai Excel
83 ranger w/87 2.9 L FI2wd auto 18mpg on the floor
04 Mitsubishi Gallant 2.4L auto 26mpg
06 Subaru Forrester XT(WRX PACKAGE) MT AWD Turbocharged 18 plying dirty best of 26mpg@70mph
95Chevy Blazer 4x4 auto 14-18mpg
04 Chevy Blazer 4x4 auto 16-22mpg
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