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A tonneau cover system is provided for a cargo box of a pickup truck. The cargo box including a sidewall having an inboard side, wherein the inboard side extends downward and includes a lower edge. The tonneau cover system comprises a framework assembly positionable over the cargo box of the pickup

A tonneau cover system is provided for a cargo box of a pickup truck. The cargo box including a sidewall having an inboard side, wherein the inboard side extends downward and includes a lower edge. The tonneau cover system comprises a framework assembly positionable over the cargo box of the pickup truck and a bed rail extender having an engagement surface. The bed rail extender is adapted to attach to the inboard side such that the engagement surface is spaced downward from the lower edge of the inboard side. A clamp assembly is operably coupled to the framework system. The clamp assembly has an engaging member selectively positioned between a latched position and an unlatched position. The engaging member is adapted to contact the engagement surface of the bed rail extender in the latched position to retain the framework assembly to the cargo box.

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1. A tonneau cover system for a cargo box of a pickup truck, the cargo box comprising a sidewall having an inboard side, said inboard side extending downward and comprising a lower edge, the cargo box further comprising a bed cap having an inboard leg extending downward below the lower edge of the i

1. A tonneau cover system for a cargo box of a pickup truck, the cargo box comprising a sidewall having an inboard side, said inboard side extending downward and comprising a lower edge, the cargo box further comprising a bed cap having an inboard leg extending downward below the lower edge of the inboard sidewall, the tonneau cover system comprising: a framework assembly positionable over the cargo box of the pickup truck;a clamp assembly operably coupled to the framework assembly, the clamp assembly having an engaging member selectively positioned between a latched position and an unlatched position; anda bed rail extender having an engagement surface and being designed to attach to the inboard side independent of the clamp assembly with the engagement surface spaced downward from the lower edge of the inboard side of the cargo box and below the inboard leg of the bed cap;wherein the engaging member of the clamp assembly is adapted to contact the engagement surface of the bed rail extender in the latched position to clamp the framework assembly to the cargo box without applying a compressive force to the inboard leg of the bed cap of the cargo box. 2. The tonneau cover system according to claim 1 wherein the bed rail extender is a clip comprising a main body portion and a pair of leg members extending from the main body portion to define a channel therebetween, the channel being sized to receive the inboard side of the cargo box of the pickup truck. 3. The tonneau cover system according to claim 2 wherein the pair of leg members exert a clamping force upon the inboard side of the cargo box of the pickup truck. 4. The tonneau cover system according to claim 2 wherein the pair of leg members are identically sized and arranged. 5. The tonneau cover system according to claim 2 wherein the pair of leg members each defines varying cross-sectional profiles relative to each other. 6. The tonneau cover system according to claim 2 wherein a first of the pair of leg members is generally straight and a second of the pair of leg members is generally V-shaped. 7. The tonneau cover system according to claim 1 wherein the pair of leg members each defines varying cross-sectional profiles relative to each other. 8. The tonneau cover system according to claim 1 wherein the clamp assembly is a locking spring clamp assembly. 9. The tonneau cover system according to claim 1 wherein the clamp assembly is a wing nut clamp assembly. 10. The tonneau cover system according to claim 1 wherein the clamp assembly is a cam actuated clamp assembly. 11. A tonneau cover system for a cargo box of a pickup truck, the cargo box having an inboard sidewall extending downward to a lower edge, the cargo box having a bed cap having an inboard leg extending downward beyond the lower edge of the inboard sidewall, the tonneau cover system comprising: a framework assembly positionable over the cargo box of the pickup truck;a clamp assembly operably coupled to the framework assembly, the clamp assembly having an engaging member selectively positioned between a latched position and an unlatched position; anda bed rail extender having an engagement surface, the bed rail extender being designed to attach to the inboard sidewall independent of the clamp assembly with the engagement surface spaced downward from the lower edge of the inboard sidewall and below the inboard leg of the bed cap;wherein the engaging member of the clamp assembly is adapted to contact the engagement surface of the bed rail extender in the latched position to clamp the framework assembly to the cargo box, and wherein the bed cap remains coupled to the sidewall of the cargo box allowing the clamp assembly to move away from the bed cap when the engaging member is in the unclamped position. 12. The tonneau cover system according to claim 11 wherein the bed rail extender is a clip comprising a main body portion and a pair of leg members extending from the main body portion to define a channel therebetween, the channel being sized to receive the inboard sidewall of the cargo box of the pickup truck. 13. The tonneau cover system according to claim 12 wherein the main body portion comprises the engagement surface. 14. The tonneau cover system according to claim 11 wherein the bed rail extender is clamped to the inboard sidewall of the cargo box of the pickup truck. 15. The tonneau cover system according to claim 12 wherein the pair of leg members are identically sized and arranged. 16. The tonneau cover system according to claim 12 wherein the pair of leg members each defines varying cross-sectional profiles relative to each other. 17. The tonneau cover system according to claim 12 wherein a first of the pair of leg members is generally straight and a second of the pair of leg members is generally V-shaped. 18. The tonneau cover system according to claim 11 wherein the pair of leg members each defines varying cross-sectional profiles relative to each other.