Various enhancements to the capabilities of vehicles in general, and particularly light-duty utility vehicles, which can advantageously enhance the cargo-carrying capabilities of such vehicles. The present invention provides a cargo bed insert, as well as an insert system, for removable attachment to a vehicle's existing cargo box. Improvement to a light-duty utility vehicle, where the improvement is in the form of a cargo box for the vehicle which includes one or more features of the described cargo bed insert and/or system is disclosed. The invention contemplates methods for enhancing the cargo-carrying capability of a light-duty utility vehicle. In particular, methods for enhancing the cargo-carrying capacity of such a vehicle beyond a manufacturer's specified cargo weight capacity are provided. Lastly, the invention includes a mounting assembly for a removable attachment to a vehicle's frame. The mounting assembly may be employed as a stand-alone item, or in conjunction with the cargo bed insert, to create a system for enhancing a vehicle's cargo-carrying capability.