A novice's question about towing a car behind a Class C

Bumpyroad wrote:

2mustangs wrote:
The Navion is rated to tow 5000. I read tongue weight can be estimated at 10 - 15% of toad weight. Don't own a bath scale but I will go to the truck scales once I've loaded everything.
By the way, thank you for your military service to our country. We're two retired Marines.

that 10-15% is tongue weight for a TT, the only tongue weight for the toad is about 1/2 of the weight of the tow bar?? I would guess.
bumpy