Indeed. I've made impulsive decisions before....they usually didn't work out great, and if they did, it was just blind luck.
The salesman will tell you "I have 4 other people looking at this rig...the time to act is now." Nonsense....if he did, one of them would have probably bought it. That's an old tactic to get you to make an impulsive decision. Go home and sleep on it. Can save you a lot of grief.
But I digress. I think if the OP hadn't stumbled on a "cheaper" coach, he'd be posting pics of his great new RV a week from now, and having a blast with it this summer. The sour taste in his mouth isn't the RV, it's the deal. And here's why that shouldn't be the case...
When trade ins, financing, and options are involved, the priced gets juggled 6 ways from Sunday. You might have got it $5000 cheaper at another dealer....and they might have offered you $6000 less on your trade.
My advice....Go in to the dealer, finish the deal, and enjoy your new RV. Life is too short to waste it, and I think pursuing legal recourse on this (if there indeed IS any) is a waste of your time. If it makes you feel vindicated, you can give the dealer the middle finger salute when you're driving off.