In many states, you can go to a 102" trailer. Some hold the line at 96".
Of course, whether the tires and fenders are outside or inside the sidewalls makes a difference. Outside is an easier fabrication. Probably more common.
If you have the trailer then that changes the whole conversation.
I do agree with the 96" tail width and plan to build a 102" custom trailer. 13' sidewalls with a tapered nose. Wings go on walls over fender well, fuselage goes up the middle.
How much do you plan on cutting down? Inches are one thing but feet would require some head scratching.
Tom XL-7