Knowing what trouble makers you people are, I am surprised they let you stay at all!!!! - (obviously kidding!)
I always struggle with the on-line CG registrations. Somehow TC's usually don't fit in their standard "RV types". What length do you put? The length when it is on the truck? Off the truck? Length of the whole rig when off the truck? Is it 2 vehicles?
I just wing it and will try to explain if it ever comes up. Around here, people don't know what to make of them anyway. I can show friends pictures on and off the truck and they still don't get it.