MODULAR PICK-UP TRUCK CHASSIS FRAME STRUCTURE THAT MAXIMIZES THE RECHARGEABLE ENERGY STORAGE SYSTEM PACKAGE VOLUME FOR BODY-ON-FRAME BATTERY ELECTRIC VEHICLE ARCHITECTURES INTRODUCTION

A vehicle frame structure including a pair of elongated mid bay rails with a cross beam extending between rear ends of the pair of mid bay rails. A pair of elongated rear bay rails define an overlapping joint with the pair of elongated mid bay rails, wherein a first pair of reinforcement members connect forward ends of the pair of rear bay rails to the pair of elongated mid bay rails and a second pair of reinforcement members connect rearward ends of the pair of mid bay rails to the pair of elongated rear bay rails.