A frame assembly for a vehicle can include a fixed frame assembly, a removable frame assembly and a bracket. The fixed frame assembly can include a rear frame member extending along a longitudinal direction of the vehicle. The removable frame assembly can be selectively removed and attached to the fixed frame assembly. The removable frame assembly can include a tubular frame member extending along the rear end of the fixed frame assembly, and can be configured to deform in a predictable and predetermined controlled manner if a load or kinetic energy input to the tubular frame member is greater than a first predetermined threshold. The bracket can be connected to the tubular member and the rear frame member, and the bracket can be configured to deform in a predictable and predetermined controlled manner if a load or kinetic energy input to the bracket is greater than a second predetermined threshold.