The Yakima Trailer Heavy Duty Shocks increase your trailer load rating up to 300lbs. The Yakima Heavy Duty Shocks only work with both the Yakima RACKandROLL 78 Trailer.
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Yakima RACKandROLL Trailer Heavy Duty Shocks Instruction Manual (.pdf)
Yakima warranty and product registration.
All other sites say you can use them with the 66" model. Just not over 250 lbs. Your site say not for use with 66" so what is the difference?
2007 Rack and Roll Trailer N/A 66"
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