Question: 

How do I know which Tow & Stow hitch model I should purchase?

Answer: 

For most vehicles, the Model 6 is the appropriate Tow & Stow hitch. However, if you have a vehicle with oversized tires, a lift kit, or a trailer that is not at the same relative height as your receiver, you may need a Model 8 or Model 10. The following diagram depicts how to calculate what is commonly referred to as 'drop.'

Image: 

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File calculate_the_drop.webp