As i recall when i installed my goosebox, there were two different bolt patterns with different heights. I installed mine so that i have about 9" of clearance between the bottom of the trailer and the truck bed rail. It is important that you keep at least a minimum of 7" clearance. If you have any tight unlevel turns you can damage the truck and the trailer.
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Jack & Tanya Wenger
Missoula, MT
2006 Montana 2980RL
2004 Chev 2500 HD
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