Where are Torklift Hitch Extenders Measured From

Hi there. Been looking on the QandA, just doesn’t seem to be a solid answer… 2018 F350 DRW with Eagle cap 955. From the Face of my 3” factory receiver to the rear of my truck camper bumper is 41” Where EXACTLY do the torque hitch extensions measurements come from ? Pin to pin or pin to the face? Or truck receiver face to the hitch extension face?? Ideally the shorter the better for sway and weight, so the 42” or the 48” is what I’m trying to accurately figure out Thanks.

asked by: Ron S