We bought that exact model last June. We had the dealer special order one with the options we wanted. We ordered the second AC and all the insulation we could get. We are in SC, and like you in Louisiana, know a little about heat and humidity. A camper that big needs alot to keep it cool at 98 degrees and ours could be an ice box if we wanted.
Quality wise, we have had no issues with anything that KZ actually built. Our only issues have been with the furnace, which has been a real pain. Though KZ has taken care of the problem to our satisfaction, thus far. For us the two year warranty was a key selling point, I can only hope Thor doesn't screw things up too much. Our unit was one of the last ones built before the change of ownership.
I tow mine with a new 2500 Ram 6.4L. Traded up from a very tired 2500 Chevy. I also have a Propride 3p, but it really tows quite nice. With your experience it should not be an issue.
Downsides that i see with the unit. The biggest one is lack of payload. A camper this big really should have at least a 10500 GVW. Mine is only 9500. We don't typically tow very much water, but if all the tanks were full, it leaves precious little carrying capacity. It seems such a shame with all those big ole cabinets to fill up. The other thing I don't like is the two grey water dumps and the location of the fresh water inlet on the rear of the unit. It's more of an annoyance than anything, but you have to carry a "Y" and additional sewer hose to accommodate the two outlets, and an additional water hose to reach the inlet. I also don't like that you can't access the restroom or fridge with the slides in. May not be an issue for you but we like to stop at a rest area and have lunch and hate to have to fold everything out in a parking lot.
All in all, we are very happy with the unit, and would buy it again if given the opportunity. Good luck.