ZIP-TIES. Ideally, an assortment of several different sizes. Make sure to get ones with high tensile strength. I used these for the inevitable mishaps during my trip from Atlanta to Alaska a few years ago...

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-1985 300TD - 324k mi on chassis. MB "Tauschaggregat" 617 motor + 4-speed conversion
Alaska Roadtrip 2009
-2002 E320 Wagon - 197k mi
-1998 E320 Wagon - 310k mi - retired