As mentioned earlier, you can swap your double-axis-tilt military 5th wheel to a civilian one pretty easily.
Unless you are planning to drive over some very rough off-road terrain (which might not go well with a civvy trailer anyway), you will never need that second tilt axis and it will be locked out.
I recently swapped a Fontaine slider onto one of my M931A2's. Since the 931 frame is the same width as commercial vehicles, it was a simple matter of drilling new bolt holes in the side flange that the military 5th wheel mounts to.
This lowered the 5th wheel plate slightly over 6". It also allows me to move the 5th wheel back a bit to haul short necked trailers, like my M146, and not have the tires rub on the landing gear. With the 931A1/2, the fat butt due to the tires can be an issue with a lot of trailers, even larger ones.
I did this mainly because my M129A4 sat at 13'9" at the nose when on the 931 (!) The ADC-TSS is almost as tall. 14' is max height in Texas, but if you are off the highway, things like traffic lights are
supposed to be high enough, but are only
required to clear a 13'6" vehicle, so if you are over 13'6 and hit a light or sign, you are liable for the cost of fixing it (! again).
I also haul a military-surplus civilian lowboy trailer with the 931. Even the slight reduction of height of the civvy 5th wheel made a difference in bed angle, and also made a
significant difference to the suspension geometry of the rear bogie.
A pleasant side effect is that the landing gear will now lift the trailer clear of the 5th wheel without having to use the block plates I previously had to put under there.
Going to 11.00 tires would further decrease your height, and also give you a slightly better turning radius since you could move the steering limiters in some. They are pretty far out for the 14.00s to keep them from rubbing, so the 931s turn like a much longer truck (as in - turning radius sucks compared to other tractors I drive, like the M915).
Hauling my M270 around can be a pain, kinda like warping a destroyer around corners. It is 50' long, and the axles are all the way at the back.
Cheers