While you have the info for each one individually, the dealer will always look at the totality of the deal, at the bottom line. You can rest assured if he gives you more on the trade, he will not discount the new one as much. It's no different when trading in a car. Same principal applies.
I usually try starting out by negotiating the price on the new vehicle/RV. Then try to do the best I can with the trade (if I have one).
It's called Nada GUIDE for a reason. There's no guarantee they will get $176K selling your used one.
Mike