Riptily, very interesting! I have a few questions for you.
The FRR seems to be the lighter version of the series, correct? The body builder guide rate it at 19,500lb GVWR, the same as the NRR. A 6800 pound front axle vs the 10,000 pound front axle on the FTR,FSR,FVR. The T7500 are similar...