I finally won the war!! ;-)
So after 2 failed afternoon sessions, I decided to commit Saturday and was determined not to be defeated. What better day to chose than my Birthday! Ha!. Breaker bar for the win! I was finally able to get good leverage and use a breaker bar to get these rusted nuts lose. I was able to use the frame and other bolts to wedge the opposite side with a wrench and get after it. I think a lot of my problems were around 1- trying to do it after work and 2- being a bit afraid of crawling under the trailer and having it fall with me reall pulling hard on the bar, hammering, etc. so I was not in the best positions to get the most torque. My air impact and my 18V impact were no match for the rust. So I first hooked it to the truck so that it could not go forward or backward and second added even more jack stands. It was probably fine but it made me more comfortable really getting in there.
I must say, I was exhausted after that. Even though it worked, every bolt was a battle even with PB Blaster applied. ANyway, CRE3000 with wet bolt kit is now installed and ready for our next trip, Excited to see if I notice a difference in towing.
Thanks again all for the help! No way I was letting this thing beat me